Question

问一个有关英语语法的问题

The kettle water ______(boil) for 3 minites before it _____(take) away for the stove.

请问这两个空该怎么填？
知道的朋友帮忙回答， 并讲讲道理， 谢谢了

Answer 1

该题有三种答案：
1、The kettle water has to be boiled for 3 minutes before it can be taken away for the stove.
(这壶水需要在炉子上煮3分钟才可以拿下来。)
2、The kettle water had to be boiled for 3 minutes before it colud be taken away for the stove.
(这壶水需要在炉子上煮3分钟才可以拿下来。)
3、The kettle water had been boiling for 3 minutes before it was taken away for the stove.
(这壶水在炉子上沸了3分钟才被拿下来。)

1和2是描述一个条件，讲“水”什么时候可以从火上取下来。
3讲的是一个事实，讲“水”是什么时候被取下来的。

前两个句子中，boil是及物动词，与to have to (必需)共同构成被动态。
第三个句子里boil是不及物动词。由于讲述的都是发生过的事情，因此需要使用过去式和过去完成式。

Answer 2

前边是had been boiling,后边是was taken
首先就句型及意思而言就决定了前边是过去完成时,后边是过去时,而且是被动语态
由于水持续沸了3分钟,也就是一直在沸,所以要在过去完成时的基础上加上进行时
当然也可以是has been boiling和is taken,不过要看具体语境

Answer 3

had been boiling ,was taken
壶里的水滚了三分钟之后才被从炉子上拿开

Answer 4

has to be boiled; is taken
整句时态应为一般现在时

Answer 5

The kettle water was boil for 3 minutes before it had taken away from the stove.