If you__________(finish) reading the novel before I leave,please give it back to me.

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If you__________(finish) reading the novel before I leave,please give it back to me.

祈使句用原形 finish
假如用can,could,able to之类的,意思就变成了"你要是可以在我离开之前就读完这个小说,请把它拿给我(现在就)"
用原形表示读完才拿给我

could finish
如果你能在我离开之前读完这本小说,请把它还给我。

have finished 如果你在我离开之前读完这本小说了,就请你把它还给我。

finish