山根有横纹科学说法:求教狂简单的英语,不过我做不来

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⑴I bought a new bookshelf a moment ago.I have it now改写同义句
I___ ___ bought a new bookshelf.

⑵I don’t know when she ___(return),but when she___(return)I ___(let) you know.

have just
原句意思是:我刚买了一个书架,现在已经拥有它了,言下之意:我已经买了一个书架了:have done完成时表已经完成的动作

will return ,returns, will let
意思是:我不知道她什么时候会回来,等她回来的时候我会告诉你的
前半句的when指“何时”:我们先缩句:她什么时候回来?when will she return
所以组装一下,知道是将来时态,用will
第二个when是“当……的时候”,表将来的要用现在时
所以不用will

have just

will return returns will let

just have
would turn returns will let

have just

will return, returns, will let

have just
will return,returns,will let

at once,
will return,returned,left(leave的过去式是left)