英语翻译这句是用一般过去时还是现在完成时?感觉Mun has cooked dinner an hour ago不对··

英语翻译这句是用一般过去时还是现在完成时?感觉Mun has cooked dinner an hour ago不对·· They left an hour ago变成现在完成时 We cooked the dumplings an hour ago.(用for an hour改写） She typed it an hour ago.改为现在完成时 I finished my homework an hour ago(改为现在完成时) 用现在完成时改写 Our teacher came here an hour ago two years ago 前面用一般过去时还是现在完成时 英语现在完成时练习Mother has cooked the dinner and cleaned the kitche since 还是 for an hour ago The meeting has been on since an hour ago “She has come here an hour ago”这句话对吗? 一般过去时还是现在完成时