it is over a year since i met him 为什么要用since since前不是要用完成时吗?

it is over a year since i met him 为什么要用since since前不是要用完成时吗? It is over a year since I last wrote to him.为什么前面不用完成时?It ha 英语翻译It is over a year now since I began studying English.I a It is over a year now since i came to the company,but i __th I haven't met him since 1999.=It's ( ) years since I ( ) him A:is it three years since you met him last?B:__three years__ “it is over a year now since cathy came to china.she is now 英语翻译It is over a year now since Cathy came to China.She is n 以"It is over a year now since Cthya came to china"的阅读 I ( ) you very much .It is a long time since we last met 1.I ____you very much.It is a long time since we last met.(m it is years since i saw him（追加）