摘要：The old man has died, and he died two years ago. 那个老人已经去世了，他是两年前死的。My brother has joined the army, and he joined it half a year ag
现在完成时有两种情况，即短暂性动作和延续性状态。两者接的时间状语各不一样。
一，短暂性动词不能接since和for，只能在过去式中接过去时间状语。
The old man has died, and he died two years ago. 那个老人已经去世了，他是两年前死的。My brother has joined the army, and he joined it half a year ago.我弟弟已经当兵了，他是半年前参军的。My uncle has left Tianjing, and he left the day before yesterday.我叔叔已经离开天津，他是前天走的。Tom has come back from work, and he came back thirty minutes ago.汤姆已经下班回家了，他是半小时前回来的。Mary has caught a bad cold, and she had it a week ago.I have bought a mobile phone, and I got it three days ago.二，短暂性动作可以用be动词构成的词组，或其它动词来代替相应的意思，这时可以接since和for
The old man has been dead for two years. 那个老人已经去世两天了。My brother has been in the army since half a year ago.我弟弟已经当兵半年了。My uncle has been away from Tianjing for two days.我叔叔已经离开天津两天了。Tom has been back home for half an hour.汤姆下班回家半小时了。Mary has had a bad cold since a week ago.马丽得重感冒已经一个星期了。I have had the mobile phone for three days.这个手机我已经买了三天了。了解了两种形式的表达法，以后在写作和语法选择方面，就会轻松很多。
动词时态的学习还需要同学们的练习，只有通过多阅读，多做题，才能巩固所学知识。今天推荐几种语法练习，有利于大家参加各种考试的时候，轻松得高分。
来源：郑老师KMYYZY