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1. 過去進行時
談?wù)撨^去某個時候正在發(fā)生的事情
I was playing football at 3:30 yesterday.
談?wù)撨^去同時發(fā)生的兩件事
He was doing homework while his sister was watching TV.
過去進行時和一般過去時出現(xiàn)在同一個句子中:
Iwas doing homework when mysister cameto talk to me.
Someone knocked at the doorwhilemy mother was cooking.
表達(dá)否定句、疑問句:
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可以作為can過去式使用
can/can't表示能力,用于當(dāng)前時間
I canhelp you.((我可以幫助你)
could/couldn't過去時用于表示能力。
can/can't用于當(dāng)前時間的表示概率
This can't be true.(這不可能是真的)
could表示概率,用于過去時,或用于現(xiàn)在時,但語氣沒有can強烈
He couldn't go therewithout me.(他不能不帶我一起去)
can/could它也可以用于今天的請求。不同的是,它可以用于今天的請求could比can語氣更加委婉禮貌
Can you help me please?
Could you please open the door?
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