KET 在线
模拟测试
小程序在线模拟测试
PET 真实
考场模拟
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1. 过去进行时
谈论过去某个时候正在发生的事情
I was playing football at 3:30 yesterday.
谈论过去同时发生的两件事
He was doing homework while his sister was watching TV.
过去进行时和一般过去时出现在同一个句子中:
Iwas doing homework when mysister cameto talk to me.
Someone knocked at the doorwhilemy mother was cooking.
表达否定句、疑问句:
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
有时,could可以作为can过去式使用
can/can't表示能力,用于当前时间
I canhelp you.((我可以帮助你)
could/couldn't过去时用于表示能力。
can/can't用于当前时间的表示概率
This can't be true.(这不可能是真的)
could表示概率,用于过去时,或用于现在时,但语气没有can强烈
He couldn't go therewithout me.(他不能不带我一起去)
can/could它也可以用于今天的请求。不同的是,它可以用于今天的请求could比can语气更加委婉礼貌
Can you help me please?
Could you please open the door?