couldn't have finished和 can't have finished 的区别

We didn't have enough time.We couldn't finish the work .(合并句子） Tom () his homework yesterday,because he was in hospital all day.A.can't finish B.couldn't finish C.couldn't have finished D.mustn't finish选哪一个呢?我也选的C，但是是感觉。 can’t / couldn’t have We didn't have enough time.We couldn't finish the work.(合并句子) We didn'We didn't ___ ___ ___ ___ finish the work. 高一英语问问 we ( )the work so early withoutyour helpwe ( )the work so early withoutyour helpA couldn't finishB can't finish C couldn't have finishedD can't have finished为啥选C而不是选A呐? couldn't have done和couldn't do的区别 填介词 I couldn't finish it() your help. I couldn’t possibly have finished such a long book in such a short time.我想知道,为什么用 have finished ,而不用finish? We didn't have enough people to do the work,so we couldn't finish the work on time.合并句子 A:Must l finish reading the book today?B:No,you___if you have sth else to do.A.mustn't B.couldn't C.can't D.don't have to I couldn’t have said it better. they couldn't have done better是什么意思 i couldn't have enjoyed any more couldn't don't have to needn't的区别 We couldn't finish the work if you didn't help us.We couldn't finish the work ____ ____ help.改为同义句 We couldn't finish our work so early----you helpWe couldn't finish our work so early----you helpA.without B.with C.for D.by He couldn't finish the work yesterday 同义句转换He ____ ____ ____ finish the work yesterday. should have done ,shouldn't have done.could have done,couldn't have done