2018北京小学英语高频重点句型9
27、Its time for sb. to do sth. 是某人干某事的时候了
it 是形式主语，真正的主语是动词不定式 to do sth.
例如：
Its time for the child to go to bed.
孩子该睡觉了。
比较下面两种结构：
① Its time for + n.
例如：
Its time for school.
②Its time to do sth.
例如：
Its time to go to school.
28、It takes sb. some time to do sth. 花费某人多少时间做某事
it 是形式主语，真正的主语是动词不定式 to do sth。
例如：
It takes her fifteen minutes to walk to the bus stop from here.
从这儿走着到公交车站将花费她 15 分钟。
It took the old man three days to finish the work.
那个老人花了三天时间完成这项工作。