The doctor said he could help him.(能力)
医生说他能帮助他。
Lily could swim when she was four years old.(能力)
当丽丽四岁的时候她就会游泳。
At that time we thought the story could be true.(可能性)
那时我们以为所说的可能是真的。
could可代替can表示现在时间的动作,但语气较为婉转。例如:
Could I speak to John,please?
我能和约翰说话吗?
Could you?在口语中表示请求对方做事。例如:
Could you wait half an hour?
请你等半个小时好吗?
Could you please ring again at six?
六点钟请你再打电话好吗?
(4) can的形式
只有现在式can和过去式could两种形式。能表示一般现在和一般过去两种时态,有时也能表示将来。所有其他时态(包括将来时)须用be able to加动词不定式来表示。例如:
They have not been able to come to Beijing.
他们没有能到北京来。
日常交际用语
1. Thats right.
Thats right意为对的,表示赞同对方的意见、看法或行为,肯定对方的答案或判断,其相反的表达是Thats wrong.有时Thats right.=You are right. Thats wrong.=Youre wrong.
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