2023年考博英语涉及表示过去的能力和可能性的语法点

2022-04-03 07:30:00来源：网络

　　考博英语是考博中重点考察的科目，想要更好的拿到高分成绩，对于同学来说，大家在实际的备考中，需要更全面的复习。考博英语考察的内容比较多，基础词汇、听力、阅读以及翻译技巧，还有写作，这是都是一套卷子的基本构成。那么对于每个部分，应该进行有针对性的训练。下面小编为大家整理了“2023年考博英语涉及表示过去的能力和可能性的语法点”，供大家参考。

　　In the present tense we use ‘can’ to talk about a general ability – e.g. I can swim – and also for ability at a particular moment – e.g. I can see you! The rules for talking about past abilities are different.

　　现在时态里，我们用can去谈论一般的能力，例如I can swim。还有形容在一个特定的时间的一种能力，例如I can see you!但谈论过去的能力是不同的。

　　General ability 一般的能力

　　We use could to talk about general abilities in the past.

　　我们用could谈论过去一般的能力。

　　He could speak fluent French when he was 5.

　　I could read before I started school.

　　Ability on one occasion 某个场合的能力

　　However, when we talk about ability on one particular occasion, we can’t use could

　　但是，当我们谈论某个特定场合下的能力，我们不能用could。

　　The burglar was able to get in through the bathroom window.

　　The burglar managed to get in through the bathroom window.

　　We have to use was able to or managed to. We can’t use could.

　　我们必须用was able to 或者managed to，我们不能用could。

　　The burglar could get in through the bathroom window.

　　Ability on one occasion – negative 某个场合的能力—否定式

　　When we talk about a particular occasion when something wasn’t possible, we can use wasn’t/weren’t able to, didn’t manage to, or couldn’t

　　当我们谈论某个特定场合不能做某事的能力时，我们用wasn’t /weren’t able to, didn’t manage to, 或是couldn’t

　　The burglar wasn’t able to get in through the window.

　　The burglar didn’t manage to get in through the window.

　　The burglar couldn’t get in through the window.

　　Hypothetical past ability 假设的过去的能力

　　Sometimes things were possible in the past but didn’t happen.

　　有时候，我们要描述在过去可能会发生但是没有发生的事情。

　　I could have gone to university but I decided to get a job.

　　I would have been able to win the race but I fell over.

　　We use could have (+ past participle) or would have been able to to talk about these hypothetical events. They can be used in the positive and the negative.

　　我们用could have (+ 过去分词) or would have been able to 来谈论这些假设会发生的事件。他们可以是肯定式，也可以是否定式。

　　I couldn’t have done it without your help.

　　I wouldn’t have been able to afford it even if it had been for sale.

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