题目内容
Look at the sky,it ________ snow.
- A.is about
- B.is to
- C.will
- D.is going to
正确答案为D
在表示将来的动作这种结构中,be about to和be to,will和be going to都有这一层含义,它们的区别如下:
be to和be about to是表示已经预计和早已安排的动作,“即将发生”。例如:
He is about to come.
他就要来了。
We are to discuss with you.
我们要和你讨论一下。
will则表示将会发生的动作和状态。例如:
He will start school soon, won't he?
他很快就要上学了,是吗?
be going to用于天气则表示根据迹象判断要发生的情况,这种发生是不以个人的意志而转移的。例如:
It is going to rain,isn't it?
要下雨了,对吗?
There is going to be a heavy snow,isn't there?
要下大雪了,可不?
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