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问题: 状从

his mother couldn't buy him a piano ____ he was seven.
when or until?

解答:

选until为好。句子的意思是‘到他7岁时,母亲才给他买了钢琴’。句子用到了一个结构“not .....until....直到....(时候);....才....”。

如果选用when,就是说‘在他7岁时,母亲没有给他买钢琴’。那么主句的谓语动词,就没有必要加情态动词了,直接否定就可以了。就是his mother didn't buy him a piano when he was seven。