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ket核心语法怎么教:could you please open the door

来源:小编 编辑:小编 日期:2023-04-03 22:10:33

1. 过去进行时

用来谈论过去某一时间正在发生的事情。

I was playing football at 3:30 yesterday.

用来讨论过去某一时间同时发生的两件事

He was doing homework while his sister was watching TV.

过去的情况和过去的情况发生在同一句话中:

Iwas doing homework when mysister cameto talk to me.

Someone knocked at the doorwhilemy mother was cooking.

否定句,疑问句的表达方式:

He was not/wasn't working.

They were not/weren't speaking to each other.

Was he working?Yes, he was/No, he wasn't.

Were they speaking to each other? Yes, they were/No, they weren't.

2. can/can't/could/couldn't

有时,could可用作can的过去式。

can/can't表达能力,用于当今时代。

I canhelp you.(我可以帮助你)

could/couldn“t表示能力,在过去使用。比较:

can/can't表示概率,用于当今时代。

This can't be true.(这个不可能是真的)

could表示概率,用于过去,或者用于现在,但是语气不如can强烈。

He couldn't go therewithout me.(他不可能不带我一起去)

can/could也可用于当今时代的请求,不同之处在于could比can语气更加委婉客套。

Can you help me please?

Could you please open the door?

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