My mother won't let me go out to play until my homework_____A.finished B.is finishedMany students enjoy the book Harry Potter____by J.K.A.written B.was written这两道题有什么区别么?为什么第一道选B,第二道选A?

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My mother won't let me go out to play until my homework_____A.finished B.is finishedMany students enjoy the book Harry Potter____by J.K.A.written B.was written这两道题有什么区别么?为什么第一道选B,第二道选A?
My mother won't let me go out to play until my homework_____
A.finished B.is finished
Many students enjoy the book Harry Potter____by J.K.
A.written B.was written
这两道题有什么区别么?为什么第一道选B,第二道选A?

My mother won't let me go out to play until my homework_____A.finished B.is finishedMany students enjoy the book Harry Potter____by J.K.A.written B.was written这两道题有什么区别么?为什么第一道选B,第二道选A?
我来解释一下.第一道题选B,是因为由 until 引导的从句中,my homework 是主语,需要用被动语态 is finished 做谓语;而第二道题主谓宾结构完整,没有出现引导从句的连词,所以只能填 written 这个过去分词作定语,修饰 Harry Potter, 它相当于定语从句的作用,即: that is written by J.K.

作业本身没有执行能力,就是说自己不能完成,而是被完成,故用被动词语态
因为句子已有谓语动词ENJOY,故后面不能再有谓语动词即不能用B,用过去分词作后置定语。

当然有区别,第一题,until引导的时间状语从句,看清楚哦,是个句子,所以要有完整的谓语部分,被动语态 be的适当形式+过去分词;第二题,只是缺一个过去分词短语作后置定语,它只缺分词定语啊,不缺谓语啊

第一道题是由until引导的时间状语从句,因此要用完整的句子。而第二道中作的是定语,完整结构是:Many students enjoy the book Harry Potter (which was) written by J.K.

第一题是表示状态,第二道作定语 ,自己好好体会啦~