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问题: 问一句句子

书上有句句子是It's best to plant trees in spring because it's warmer.有两个问题,这里best是最高级形式么?为什么不加the,是省略了还是不能加?
还有,如果说It's best time to plant trees in spring because it's warmer. time和spring意思重复么?为什么?

解答:

It's best to do sth.是固定的用法呀...

如果那样改读起来有点别扭了,
首先,best前应该要加the,因为这和上面的固定用法不一样;
第二,It is the best time to plant trees in spring.总觉得很怪,如果改成正常语序不就成了To plant trees in spring is the best time?To plant trees in spring怎么会是一个time呢,是吧?应该这样改吧:Spring is the best time to plant trees because it is warm.

此句并没有什么"头重脚轻"的问题,所以改那样的话已经不需要用it作形式主语了.