It is/has been +时段+since从句 It was/be+时段+before从句 用些这英语句型造个句

It has been(is) two years since he came here.
It was two months before they reached the city
It was 5pm when they got home yesterday
This is the first time that I have visited the factory.


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it was ten o'clock when he went to school

this is the third time that he is late for class




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