汉译英,帮忙看看这几句翻译对不对
1.我在两周前给他写了封信,他一定已经收到了这封信了.
I had written a letter to he before two weeks ago,he must had received the letter.
2.他不可能去过你家,他不知道你家的地址.
He can't have been to your home,because he don't know your address.
3.他也许到上海去了,他现在不在青岛.
He might have gone to Shanghai,now he didn't in Qingdao.
4.他昨天迟到了,他可能没赶上第一班车.
Yesterday he was late,he might not have catch the first bus.
5.他已经学英语三年了.
He has studyed English for three years.