初中英语句型It's time to do.../ lt'stime for sth.

It's time to do../ lt'stime for sth.意为“该做...的时间了”其中to 后须接原形动词(不定式)，for后可接名词或 V- ing形式。

It's time to havelunch.= lt's time forlunch.

lt's+时间段+since主语+动词过去式(瞬间动词).=lt has been+时间段+since 主语+动词过去式(瞬间动词)意为:自从..起已有..多久了.

It's two weeks since we met last.=lt has been two weeks since we metlast.

自从我们上次见面已有两个星期了

How long is it since we left Beijing?=How long has it been since we leftBeijing?

自从我们离开北京已有多久了?

It takes sb. some time to do sth.此句型表示“做某事花了某人一段时间。”其中的it是形式主语，后面的动词不定式(短语)才是真正的主语= sb. spend some time on sth.( in) doing sth.

It took me half an hour to do myhomework.做作业花我半个小时。

=l spent half an hour in doing myhomework.我花半个小时做作业。

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