一般过去时的时间状语: yesterday, last week,…ago, in1980, in October, just now, 具体的时间状语
共同的时间状语: this morning, tonight,this April, now, once,before, already, recently,lately
现在完成时的时间状语 for, since, so far, ever, never, just, yet, till / until, up to now, in past years, always, 不确定的时间状语
3)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 1960)时,不能使用现在完成时,要用过去时。 (错)Tom has written a letter to his parents last night. (对)Tom wrote a letter to his parents last night.