1. “他回来了”,什么时候用He has came back , 而什么时候用He has been back, 两者有什么区别吗?
2. “他当了3年的老师”, 什么时候用 He was being a teacher for 3years , 什么时候用He has been a teacher for 3 years ?
3.完全搞不懂 been的用法,麻烦科普一下
你好,感谢您的回复,那请问“他回来了”,为什么要用He has been back,而不是He has came back???
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