It be+ ...since/before/when 分别在哪些情况下用?

英译中5句:— We can give you a ride into town1— We can give you a ride into town— Oh,that would be great.Thank you.2— Haven't seen you for ages!Do you still work in Guangzhou?—No,I don't.It's two years since I worked there.3As never befo It be .when It be .before It be .since的区别 It (be)five years since I (ride)a bike. It---------- (be) four years since I moved here. 什么时候用It be some time+since从句,什么时候用It be some time +that 从句 It will be five years since we meet again.为什么用will be 还有when? 英语长句分析：什么句型,主干是什么,修饰成分有哪些,充当什么成分,尽量详细一点,He felt weak and sore,and the pain of his smashed knuckles warned him that,even if he could find a job at navvy work,it would be a week befo It _____(be)more than three years since jim___(leave)here怎么填 It has been ten years since I ___(be) a teacher. It ___(be)one and a half years since I __(begin) to study English. It will be about three weeks____he cones back.A.after B.until C.since D.before It _(be)five years since we last saw each other. It be+ ...since/before/when 分别在哪些情况下用? It __is_________(be) three years since Lily joined the Green.为什么不是 has been it will be a long time__peter__his work.A since,has finished Bafter,finished It __ (be) five years since I ______ (come)to the country填什么 it _____(be) three years since my borther went to Hainan.(适当形式填空） It _（be) two years since he left school.答案上是is,但是为什么呢?