华慧考博英语复习:涉及表示过去的能力和可能性的语法点

2020-09-04 16:07点击次数:2920

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.

辅导课程
考博精品辅导课程 课程简介 课时 学习费用 免费试听 立即报名
考博英语VIP通关班 全程1对1专家辅导、报名即签协议、赠送全套复习资料 200课时 5980元
考博英语协议通关班 所有的专项;名师课程,详细讲解专项的解题思路、方法和技巧。 200课时 3980元
考博英语系统全程班 所有专项+冲刺班课程 名师授课 随报随学 200课时 1880元
医学VIP通关班 全程1对1专家辅导、报名即签协议、赠送全套复习资料 200课时 5980元
医学系统全程班 医学统考所有专项+冲刺班、详细讲解各专项解题思路、方法和技巧 200课时 1880元
考博英语真题班 10年跟踪研究真题、呕心沥血之作、北大 清华 中科院 社科院 医学 复旦 华科 湖北联考 30课时 780元
首页 关于华慧 联系我们 支付方式

服务热线:400-622-4468  湖南华慧网络科技有限公司  版权所有  Copyright © 2014-2024

长沙高新开发区谷苑路186号湖南大学科技园创业大厦201A40房  www.hhkaobo.com  湘ICP备18010726号-1