比较过去时与现在完成时
现在完成时可表示持续到现在的动作或状态，动词一般是延续性的，如live,teach,learn,work,study,know.
过去时常用的非持续性动词有come,go,leave,start,die,finish,become,get married等。
举例：
I saw this film yesterday.
(强调看的动作发生过了。)
I have seen this film.
(强调对现在的影响，电影的内容已经知道了。)
Why did you get up so early?
(强调起床的动作已发生过了。)
Who hasn't handed in his paper?
(强调有卷子，可能为不公平竞争。)
She has returned from Paris.
她已从巴黎回来了。
She returned yesterday.
她是昨天回来了。
He has been in the League for three years.
(在团内的状态可延续)
He has been a League member for three years.
(是团员的状态可持续)
He joined the League three years ago.
( 三年前入团，joined为短暂行为。)
I have finished my homework now.
——Will somebody go and get Dr. White?
——He's already been sent for.
句子中如有过去时的时间副词(如 yesterday,last,week,in 196
(错)Tom has written a letter to his parents last night.
(对)Tom wrote a letter to his parents last night.
以上就是培训啦的小编对公共英语考试二级口语辅导练习(20)以及它的详细介绍与分析，相信大家看完之后都已经对这方面有了更详细的认识与了解。（本文共1338字）
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