英语句子结构问题,It is encouraging that more than three years since

It _____(be)more than three years since jim___(leave)here怎么填 It is three years since he smoked. 看两个英语句子.It is three years since he was a teacher.他不当老师有三年了.I 英语修改句子 He is more than 10 years old that is more than two for every three aotomobiles.怎么分析,结构?th it ,three,since,years ,i ,moved,be 组成句子 It is three years since the war broke out. it is three years since i have seen him it is said that this old building has__for more than three h It is said that cars ( ) more than 100 hundred years ago. It is more than clear that t is three years since he joined the League?it is three year