they+have+learned+about

@台凌587:they+have还是has -
惠败18913119495…… 因为they是复数,所以不能加has

@台凌587:they 后面的have为什么不变复数 -
惠败18913119495…… have是动词啊不存在复数形式的.你是想问they后面为什么用have不是has吧?因为they是指代的多个人,意思是“他们”,而has是用于第三人称单数的,如she/he.类似,people一类复数名词都用have而不是has.望采纳.希望你学习进步.

@台凌587:翻译:他们的要求遭到拒绝.(要求用这个结构:have+宾语+宾语补足语) - 作业帮
惠败18913119495…… [答案] They had their requirement rejected.

@台凌587:They后面加has或have? - 作业帮
惠败18913119495…… [答案] 当然是have了 因为: has前是+单数名词修饰的 have前+复数名词修饰的

@台凌587:They_______ - have told me about it yesterday.选项:a,oughted to b,oughted - 作业帮
惠败18913119495…… [答案] should/ought to+have+过去分词”既可表示本该做而事实上没有做的事,也可以表示惊讶、赞叹等情绪. 如:You should have told her about it the day before yesterday. It's wonderful that you should have achieved so much in these years. “情态动词+...

@台凌587:2)They must have arrived by now,haven't they?为什么是haven't they? -
惠败18913119495…… 情态动词+动词完成时,即情态动词+have+done.表示对过去的行为或动作进行推测,评论或者判断.1.must have done.表示对过去某事的肯定猜测,其否定或疑问形式都用can/could来表示.例如:since the road is wet,it must have rained last night...

@台凌587:什么时候用Have什么时候用Has呀.例如She He My They It we -
惠败18913119495…… have用于第一人称(I),第二人称(you)或者多人(they)等,has仅用于第三人称单数(he,she,或者Jack之类的单数人名) 望采纳

@台凌587:They后面加has或have? -
惠败18913119495…… 当然是have了 因为:has前是+单数名词修饰的 have前+复数名词修饰的

@台凌587:they+have还是has - 作业帮
惠败18913119495…… [答案] have 只有单三才用has

@台凌587:They should have gone earlier, - - - ?请问为什么要didn't they -
惠败18913119495…… They should have gone earlier为虚拟语气中的主句,表示与过去事实相反的情况,从句谓语动词形式Had+过去分词(过去完成时), 主句谓语动词形式Should/would/could/might+have+过去分词(现在完成将来时) eg. If I had got there earlier, ...

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