Two years (has) passed since we began studying English 请问为何不用Have

she has been a flight attendan for two years 对 for two years 提问 two years have passed 还是two years has passed还是两个都可以? two years ago 和for two years有什么区别His grandfather has been dead______ A two years ago B for two years 填空She has been a League m___ for two years. Tom has been on the island since two years.(改错) tom didnt smoke has been two years有语法错误吗 Mr green has ()us English since two years ago he has gone for two years .改错题 mary has got married since two years ago改错 He has learnt piano for two years改错 their basktball team has been yogether for two years He has learnt piano for two years错了吗? Two years has _____ _____(流逝) before we knew it. The factory has been -----for two years.-----怎么填? Mr.Wang has （t ） us chemistry for two years She left home two years ago.（用fortwo years代替two years ago改写句子.）She has（）（）（）home for two years. Eight years (has|have) pass since he left选什么 讲下理由啊 He has learned English for about two years.(对划线部分提问)for about two years.是划线部分