Mymotherwon'tletmegoouttoplayuntilmyhomeworkA.finishedB.isfinishedManystudentsenjoythebookHarryPotterbyJ.K.A.writtenB.waswritten这两道题有什么区别么?为什么第一道选B,第二道选A?

Question

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?

Answer 1

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.