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HowlongmayI(keep/borrow)yourbike?——Foraweek.Butyoumustn‘tlendittoothers.中为什么用keep?borrow短暂是动词,我同学说没有since短语和for短语不用改为延续动词,这里都没有?eg:Iboughtanewbikejustn

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How long may I (keep/borrow)your bike?——For a week.But you mustn‘t lend it to others.中为什么用keep?borrow短暂是动词,我同学说没有since短语和for短语不用改为延续动词,这里都没有?
eg:I bought a new bike just now l.(用just 改写) I have just bought a new bike.就是弄不明白在什么时候要把短暂是动词改为延续动词,在什么情况不用!好烦
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答案和解析
哦,这是从语感方面出发的.
How long may I keep your bike?我能借留你的书多久?(一般情况)
这里问的是,一般情况下我能XXX,所以用一般式.
就是和 我爱学习,i love studying,一般来说,我爱学习.是一样的.
How long may I (keep/borrow)your bike for?答案是 a week.
How long may I (keep/borrow)your bike?答案就是 for a week
I just bought a new bike.其实也是可以的.反正在国外,i have just bought几乎用 bought 代替了.
如果说为什么要用 I have just bought a new bike,那是因为just now代表刚刚完成的意思,所以用完成时have bought 代表刚刚完成的意思..