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1. 過去進(jìn)行時
用來談?wù)撨^去某一時間正在發(fā)生的事情。
I was playing football at 3:30 yesterday.
用來討論過去某一時間同時發(fā)生的兩件事
He was doing homework while his sister was watching TV.
過去的情況和過去的情況發(fā)生在同一句話中:
Iwas doing homework when mysister cameto talk to me.
Someone knocked at the doorwhilemy mother was cooking.
否定句,疑問句的表達(dá)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
有時,could可用作can的過去式。
can/can't表達(dá)能力,用于當(dāng)今時代。
I canhelp you.(我可以幫助你)
could/couldn“t表示能力,在過去使用。比較:
can/can't表示概率,用于當(dāng)今時代。
This can't be true.(這個不可能是真的)
could表示概率,用于過去,或者用于現(xiàn)在,但是語氣不如can強烈。
He couldn't go therewithout me.(他不可能不帶我一起去)
can/could也可用于當(dāng)今時代的請求,不同之處在于could比can語氣更加委婉客套。
Can you help me please?
Could you please open the door?
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