It's a week since he went to BeiJing.请问 这里It's是不是指It is?

It's a week since he went to BeiJing.请问 这里It's是不是指It is? It is a week since he has been to BeiJing. He has caught a bad cold since last week改错 A:Is your grandpa still smoking B:No,it's years since he smoked.这里为什么用since he has been away from the factory .a a week ago b since a week ago It's five years since he became a football player(改为同义句） It's five years since he became a football player改为同义句 — How long do you suppose it is ______ he arrived here? — No more than half a week. A. when B. before C. after D. since 英语句型改写!2He has kept the book for a week.这个句子可以改写成哪些句子?It has been a week since he got the book.是否正确? It's three years since he was married .的翻译 求解英语翻译：It's 2 years since he smoked. 急 选词填空for through sometimes on during here next since at in1.Jack has gone away.He'll be back_____next week.2.We're having a party_____Saturday.Can u com?3.I've got an interview next week.It's at 9.30 ______Tuesday morning.4.Sue isn't usual 根据首字母写单词He hasn't (r ) to me since I wrote to him last week.1.He hasn't (r ) to me since I wrote to him last week.2.She thought it for a long time and made a (d )at last.3.Since my sister started high school ,her （d ） life has cha it's a long time since i saw my sister,why not visit her this week?[visit]为什么不可以用[to visit] It's two years since he left his hometown.since 为什么不能换成after He told us he____ a concert_____.A.had atteneded ;three days beforeB.attended;a week agoC.would attend;since a week ago D.was atteneding;for a week It's a long time since还是It has been a long time since It is just a week----------- we came here.填什么a:since B:until 为什么