it's time to have an English ciass 为什么用to

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it's time to have an English ciass 为什么用to
it's time to have an English ciass 为什么用to

it's time to have an English ciass 为什么用to
因为后面是实意动词have,所以用to,to是小品词,即动词不定式符号.

it is time to do sth ,,是该做什么

It's time to + 动词
It's time for +名词

it is time to do sth 这是一个固定句型,该做什么了,是到做什么的时候了

it是虚主语,后面用动词不定式做真正主语。

it's time to do 为固定用法