It's 3 years since I saw him last time.中的it's 能否换成has been?

it's years since i It's 3 years since I saw him last time.能不能换成it was... It's years since I enjoyed myself so much 翻译 It's years (since) I enjoyed myself so much.Why? I haven't met him since 1999.=It's ( ) years since I ( ) him. It's 3 years since I saw him last time.中的it's 能否换成has been? It's years since I enjoyed myself so much.其中since是什么用法? 英语翻译还有这句 It'It's three years since I was a solder.It'It's three years since I joined the army do you smoke?______.it's years since i smokedyes ,i do no,i don't It's 3 years since I saw him last time. 中的is能否换成has been? 请说明原因好吗. It three years since I smoked.翻译 It's three years since I smoked 这句话什么意思,理解不了 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 seems like years since it's been it's three years since i came to the school 中's代表的是什么的缩写 since翻译It's 5 years since I worked there.怎么翻译It's 5 years since I worked there.怎么翻译?It's 5 years since I worked there.好像是我不在那里工作已经五年了,那么用同样的句型说“我在那里工作已经五年了” It's three years since he was married .的翻译