动词的时态1一般现在时的用法一般现在时构成amisare

动词的时态1一般现在时的用法一般现在时构成amisare内容摘要：

完成时通常与模糊的时间状语连用，或无时间状语。 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 e, go, leave, start, die, finish, bee, get married等。 b 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。 ） He has been in the League for three years. (在团内的状态可延续 ) He joined the League three years ago. ( 三年前入团， joined为短暂行为。 ) 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。 Tom has written a letter to his parents last night. Tom wrote a letter to his parents last night. 11 用于现在完成时的句型 1） It is the first / second time…. that… 结构中的从句部分，用现在完成时。 It is the first time that I have visited the city. It was the third time that the boy had been late. 2） This is the… that… 结构， that 从句要用现在完成时 . This is the best film that I39。 ve (ever) seen. 这是我看过的最好的电影。 This is the first time (that) I39。 ve heard him sing. 这是我第一次听他唱歌。 12 比较 since和 for Since 用来说明动作起始时间， for用来说明动作延续时间长度。 I have lived here for more than twenty years. I have lived here since I was born.. 注意：并非有 for 作为时间状语的句子都用现在完成时。 I worked here for more than twenty years. (我现在已不在这里工作。 ) I have worked here for many years. (现在我仍在这里工作。 ) 13 since的四种用法 1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。 I have been here since 1989. 2) since +一段时间 + ago I have been here since five months ago. 3) since +从句 Great changes have taken place since you left. Considerable time has elapsed since we have been here. 4) It is +一段时间 + since从句 It is two years since I became a postgraduate student.。