Tom will have done this work before his boss comes back tomorrow.这里解释说：一般现在时comes用于时间状语从句,代替一般将来时.请问是什么叼意思?这里为什么要用comes.》》》?

will+have done can’t +have done will have done 还是will have did? should have done ,shouldn't have done.could have done,couldn't have done 区别shouldn't have done 和 needn't have done musn't have done can't have done用法区别 More amd more people have realised we won't have cleaner water to drink unless something _____ soonA.was done B.will be done C.to be done D.is done请详细讲讲,另外,be done在这里是什么意思 英语,will have done怎么用 will have been done怎么用 Many people have realized that we won't have any more clean water to drink unless something _____ to fight against pollution.A.was done B.will be done C.to be done D.is done 英语中何时使用wouldn,t have done shouldn,t have done couldn,t have done needn,t have donewouldn have done shouldn have done could have done needn have done 呢 为什么是not have done和hadn't done ? 关于英语ought to have done 与should have done的区别 有need have done needn,t have done 与should hneedn,t have done 与shouldn't have done 区别有need have done will be done和will have done是什么情况could have been呢 情态动词+have done 用法及意义must have done need have done daren't have donecould never have done could have done 求两组英语句型的解释could have done 和 couldn't have doneshould have done 和 shouldn't have done 1.Children couldn't have done all this damage.2.All of us will see him off at the airport. can't have done 的用法