Could? Could is a modal verb and is used to express possibility, a past ability, as well as to make suggestions and requests. Could is also used in conditional sentences as the
Could? Could 是一個情態動詞，用於表達可能性、過去的能力，以及提出建議和請求。Could 也用於條件句中，作為
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you will learn all the uses of the modal verb could so that you don't make any mistakes in spoken English. I am Sara, your English coach. If you are new to this channel, like, subscribe and click the bell so that you don't miss any of my new English lessons. Let's
你將學習情態動詞 could 的所有用法，這樣你在英語口說中就不會犯任何錯誤。我是 Sara，你的英語教練。如果你是這個頻道的新觀眾，請按讚、訂閱並點擊小鈴鐺，這樣你就不會錯過我的任何新英語課程。讓我們
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get started. Take a look at these five sentences. Building a flyover could ease the traffic in peak hours. Ryan could sing like a pro by the age of ten. You could watch a web series
開始吧。看看這五個句子。建造一座立體交叉橋 could 紓解尖峰時段的交通。Ryan 在十歲時 could 像職業歌手一樣唱歌。你 could 看網路影集
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or play video games. Could I use your phone to make a call to my boss? We could go on a trip if I didn't have to work this weekend. The first sentence expresses a possibility. If a flyover is
或玩電動遊戲。Could I 用你的電話打給我的老闆？If I didn't have to work this weekend, we could go on a trip. 第一句表達了一種可能性。如果建造一座立體交叉橋，
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built, it would help ease the traffic congestion during peak hours. The second sentence tells us about Ryan's past ability to sing like a pro. The third sentence is a suggestion to either
它將有助於紓解尖峰時段的交通擁堵。第二句告訴我們 Ryan 過去像職業歌手一樣唱歌的能力。第三句是建議，要麼
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watch a movie or play video games while you are at home. Fourth is a polite request where someone is asking for your phone to make a call. Possibly their phone is out of battery.
And the last sentence is a conditional sentence. It's an imaginary situation. So you can use could to talk about the possibility, talk about a past ability, make a suggestion or give advice
最後一句是一個條件句。這是一個假設的情況。所以你可以用 could 來談論可能性、談論過去的能力、提出建議或給予建議，
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for polite requests and for imaginary situations in conditional sentences. So you can use could in five different ways. Now let's understand all the five uses of could in present, past and
用於禮貌的請求，以及用於條件句中的假設情況。所以你可以用五種不同的方式使用 could。現在讓我們了解 could 在現在式、過去式和
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future tense with positive and negative statements. I want you to make sentences along with me in the comments. It will help you understand this lesson better and give you a good practice using could in different tenses. First, let's look at using could to talk about a possibility.
未來式中，以及肯定和否定陳述句中的五種用法。我希望你跟著我在評論區造句。這將幫助你更好地理解本課，並讓你好好練習在不同時態中使用 could。首先，讓我們看看用 could 來談論可能性。
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Ryan could be the one who stole the money. This sentence is in the present tense. It is possible that Ryan stole the money. Ryan could have been the one who stole the money.
Ryan could be the one who stole the money. 這個句子是現在式。Ryan 很有可能偷了錢。Ryan could have been the one who stole the money.
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Now we are expressing the same possibility in the past tense. Notice the change in the verbs after could. We have added have and been. Whenever you want to talk about a past
現在我們用過去式表達同樣的可能性。注意 could 後面動詞的變化。我們加上了 have 和 been。每當你想用 could 談論過去的
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possibility using could, could is followed by have and been. Could have been. Ryan could go to jail for stealing the money. This sentence indicates a future possibility. We are not sure
可能性時，could 後面會接 have 和 been。Could have been. Ryan could go to jail for stealing the money. 這個句子表示一種未來的可能性。我們不確定，
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but expressing a possibility. Note the verb go after could. It is in its base form.
但表達了一種可能性。注意 could 後面的動詞 go。它是用原形。
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When you want to express a future possibility using could, the verb that follows could will always be in its base form. All these sentences are positive statements.
當你想用 could 表達未來的可能性時，跟在 could 後面的動詞將始終是原形。所有這些句子都是肯定陳述句。
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Now let's look at negative statements. Ryan couldn't be the one who stole the money.
現在讓我們看看否定陳述句。Ryan couldn't be the one who stole the money.
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Here we are talking about a negative possibility of Ryan stealing the money.
這裡我們在談論 Ryan 偷錢的否定可能性。
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In negative sentences could is followed by not and in normal conversation we say the contracted form couldn't. It sounds natural and fluent. Ryan couldn't have been the one who stole the money.
在否定句中，could 後面接 not，在日常對話中我們說縮寫形式 couldn't。這聽起來自然又流暢。Ryan couldn't have been the one who stole the money.
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It also indicates a negative possibility but in the past. We have used could and not and have been. Ryan couldn't go to jail for stealing the money. Again it's a negative
這也表示一種過去的否定可能性。我們使用了 could 和 not 以及 have been。Ryan couldn't go to jail for stealing the money. 這又是一個未來的
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possibility but in the future. We have used could and not and the base form of the verb go.
否定可能性。我們使用了 could 和 not 以及動詞 go 的原形。
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It's simple. You just have to add a not after could to make negative statements.
很簡單。你只需要在 could 後面加上一個 not 就可以構成否定陳述句。
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I hope it's clear until here. Now let's look at using could for suggestions.
希望到目前為止都很清楚。現在讓我們來看看如何用 could 來提出建議。
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Take a look at this sentence. You could save money for the new camera. Someone is giving a suggestion to save money to buy a new camera, but wait a minute, I want you to tell me what
看看這個句子。You could save money for the new camera. 有人在建議存錢去買一台新相機，但等一下，我想請你告訴我
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tense is this sentence? Is it the present tense? Think about it.
這個句子是什麼時態？是現在式嗎？想一想。
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Well, it's a future tense sentence. We don't use could for suggestions in the present tense.
嗯，這是一個未來式的句子。我們不會用 could 在現在式中來提出建議。
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It's always in the future when could is followed by a verb in its base form.
當 could 後面接原形動詞時，永遠都是指未來。
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In this case, could is followed by save, but you can use could for past suggestions.
在這個例子中，could 後面接的是 save，但你可以用 could 來表示過去的建議。
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You could have saved money for the new camera. It's a suggestion in the past.
You could have saved money for the new camera. 這是針對過去的一個建議。
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Could is followed by have and saved—the verb in the third form.
Could 後面接的是 have 和 saved——也就是動詞的第三個形式。
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Now look at this sentence. You couldn't have saved money for the new camera.
現在看這個句子。You couldn't have saved money for the new camera.
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Do you think this sentence is correct? No, it's incorrect. It doesn't make any sense.
你覺得這個句子是對的嗎？不，它是錯的。這完全不通。
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We don't use could for suggestions in negative statements.
我們不能在否定句中用 could 來提出建議。
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I hope you got it. How to use could for suggestions.
希望你明白了。如何用 could 來提出建議。
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Now let's look at using could for past abilities.
現在讓我們來看看如何用 could 來表示過去的能力。
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I could run 10 kilometers in my 20s. Here could is used followed by the verb in its base form— that's run—to talk about your ability in your 20s.
I could run 10 kilometers in my 20s. 這裡的 could 後面接的是原形動詞 run，用來談論你二十幾歲時的能力。
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I couldn't run more than a kilometer in my 20s.
I couldn't run more than a kilometer in my 20s.
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Here could is followed by not. It's a negative statement.
這裡的 could 後面接了 not。這是一個否定句。
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Take a look at this sentence. Yesterday I could lift the sofa by myself.
看看這個句子。Yesterday I could lift the sofa by myself.
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Is this sentence correct? Think about it. This sentence is incorrect.
這個句子是對的嗎？想一想。這個句子是錯的。
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You can't use could in a positive sentence in which you describe a one-time ability.
當你在描述一個一次性的能力時，不能在肯定句中使用 could。
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You don't lift a sofa every day. You do it once in a while.
你不是每天都搬沙發。你只是偶爾為之。
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But you can say yesterday I couldn't lift the sofa by myself. It's a negative statement.
但你可以說「昨天我一個人沒辦法搬動沙發」，這是一個否定句。
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You can use could for a one-time ability in negative sentences.
在否定句中，你可以用 could 來表示一次性的能力。
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Always keep this in mind. These are some common mistakes you should avoid to make your English perfect.
請牢記這一點。這些是你為了讓英語更完美而應該避免的常見錯誤。
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Now let's look at using could for polite requests.
現在讓我們來看看如何用 could 來表示禮貌的請求。
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Note requests usually refer to the near future.
請注意，請求通常指的是 near future（近期的未來）。
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Could I have a cup of coffee?
Could I have a cup of coffee?（我可以喝杯咖啡嗎？）
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Couldn't you make a cup of coffee for me?
Couldn't you make a cup of coffee for me?（你能不能幫我泡杯咖啡？）
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The first statement is positive.
第一句是肯定句。
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And the second one is a negative statement.
而第二句是否定句。
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Let's look at some more examples. Could I borrow your computer?
讓我們看更多例子。Could I borrow your computer?（我可以借用你的電腦嗎？）
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Couldn't I borrow your computer for a day?
Couldn't I borrow your computer for a day?（我能不能借你的電腦用一天？）
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You always use could I or could you at the start of the sentence to request something.
你總是在句子的開頭使用 could I 或 could you 來請求某事。
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It's always better to use could instead of can for requests.
在提出請求時，使用 could 總是比 can 更好。
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It sounds more polite.
聽起來更有禮貌。
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And lastly, let's understand how to use could in conditional sentences.
最後，讓我們了解如何在條件句中使用 could。
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Could is mostly used in third conditional sentences.
Could 主要用於第三條件句（third conditional sentences）。
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Situations that are imaginary or hypothetical. Take a look at this sentence.
也就是虛構或假設的情況。看看這個句子。
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If I had more time, I could travel around the world.
If I had more time, I could travel around the world.（如果我有更多時間，我就能環遊世界。）
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Do I have the time?
我有時間嗎？
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No, I don't have it. I am busy.
不，我沒有。我很忙。
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It's just an imagination.
這只是一種想像。
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Note this sentence is in the present tense.
請注意這個句子是現在式。
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Let's say the same sentence in the past.
讓我們用過去式來說同樣的句子。
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If I had had more time, I could have travelled around the world.
如果當時我有更多時間，我就能環遊世界了。
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Again, it's just an imagination.
再次強調，這只是一種想像。
10:18
Have you noticed the verbs?
你注意到動詞了嗎？
10:21
There is a had followed by another had.
這裡有一個 had 後面接著另一個 had。
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And the verb after could is in the third form—travelled.
而 could 後面的動詞是第三形式—travelled。
10:32
Even if I had had more time, I couldn't have travelled around the world.
即使當時我有更多時間，我也沒辦法環遊世界。
10:39
That's a negative statement.
這是一個否定句。
10:42
Let's look at a sentence in the future tense.
讓我們看一個未來式的句子。
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If I had more time this year, I could travel around the world.
如果今年我有更多時間，我就能環遊世界。
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I am in the middle of the year.
我現在正值年中。
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The year hasn't finished yet.
今年還沒結束。
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And I am going to be busy until the year end.
而且我會一直忙到年底。
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It's a wish for the future which is likely to happen.
這是對未來一個很可能發生的願望。
11:04
Even if I had more time this year, I couldn't travel around the world.
即使今年我有更多時間，我也沒辦法環遊世界。
11:10
It's a negative statement.
這是一個否定句。
11:13
It specifies, although you had the time, it's imaginary.
它具體說明，即使你有時間，那也是想像的。
11:19
You don't have it.
你並沒有時間。
11:22
Still you couldn't travel because air travel is grounded due to the pandemic.
你仍然無法旅行，因為疫情導致航空旅行停擺。
11:27
I hope it's clear.
我希望這樣解釋很清楚。
11:29
So we looked at how to use the modal verb could correctly in different tenses and situations.
我們探討了如何在不同時態和情境中正確使用情態動詞 could。
11:37
I hope this lesson was helpful.
我希望這堂課對你有幫助。
11:40
That's all for today.
今天的課程就到此為止。
11:42
I will see you soon with another useful English lesson.
我很快會再帶來另一堂實用的英文課。
11:46
Until then, keep learning, keep practising English.
在那之前，請持續學習、持續練習英文。
11:51
Bye!
再見！
All Uses Of ‘Could’ In Present, Past & Future Tenses | English Modal Verbs | English Grammar Lesson
Youcannotuse 'could' inapositivesentenceforaone-timeability. However, youcanuseitinanegativesentence.
你不能在肯定句中用 'could' 來描述一次性能力。但在否定句中是可以的。
4Inthesentence 'Youcouldsavemoneyforthenewcamera', whattenseisbeingused?在句子 'You could save money for the new camera' 中，使用的是什麼時態？Inthesentence 'Youcouldsavemoneyforthenewcamera', whattenseisbeingused?
在句子 'You could save money for the new camera' 中，使用的是什麼時態？
