It's two years since my brother studied in this school =什么?最好是从It's改

It's two years since he left his hometown.since 为什么不能换成after it's years since i Lucy has been away from home for two years.（改同意句） It's two years since Lucy________. Lucy has been away from home for two years 句型转换 it's two years since Lucy（ ）（） It's two years since I smoked.怎么理解这个句子? It's over two years since I have become a teacher改错 It`s two years since he left Shenzhen 改写同意句 It's two years since my brother studied in this school =什么?最好是从It's改 it is two years since I came here还是it has been two years since I came here it's seems like years since it's been 下面几个句子的区别!1.It‘s two years since Jim Green came to China.2.Jim Green came to China for two years.3.Jim Green lived in China two years ago.4.Jim Green came to China since two years ago.第二句与第四句有什么区别呢？ It's three years since he was married .的翻译 It's years since she drove anywhere for pleasure 翻译 求解英语翻译：It's 2 years since he smoked. It's years since I enjoyed myself so much 翻译 It's years (since) I enjoyed myself so much.Why? it's five years since i______ (join) the League her grandmather has been dead for two years同义句it ___ two years since her grandmather __