【小编编语】今天查字典英语网小编教给同学们的是初中英语现在完成时语法注意事项,一起来学习下吧!祝同学们学习进步!
几点注意事项
(1)have been(to)与have gone( to)的区别:have been(to)表示“去过某地(现在已经回来了),可用于各人称;have gone(to)表示“去某地了(说话时某人不在当地),常用于第三人称,前者可与once ,never,several times等连用,后者则不能。
如:They have been to Beijing twice.他们去过北京两次。
He has gone to Beijing . 他去北京了。
(2)如单纯表示一段时间,或强调一段时间,虽有since一词,也不必用完成时。如:It is two years since his father died. =His father has been dead for two years.他父亲去世已有三年了。
(3)终止性动词现在完成时的否定式,已变成一种可以延续的状态,因此可以和表示一段时间的状语连用。
如:I haven't left here since 1997.自从1997年以来,我一直没有离开过这儿。
(2)现在完成时常见两种句型:
①主语+have / has been+for短语
②It is+一段时间+ since从句
例如:He has been in the League for three years.或It is three years since he joined the League. 他入团已三年了。
在表达一个在过去开始而现在仍在继续或刚刚结束的动作时,某些动词既可以用现在完成时,也可以用现在完成进行时。这样的动词有expect,hope,learn,lie,live,look,rain,sleep,sit,snow,stand,stay,study,teach,wait,want,work等
How long have you learnt English?你学习英语多久了?
How long have you been learning English?(译文同上。)
He has slept for ten hours.他已经睡了十个小时了。
He has been sleeping for ten hours.(译文同上。)
It has snowed for a long time.雪下了好长时间了。
It has been snowing for a long time.(译文同上。)
没有进行式的动词不可能有这样的用法,即现在完成进行时不能代替以下例句中的现在完成时:
They’ve always had a big garden.他们一直有一座大花园。
How long have you known that?你知道这事多久了?
He’s been in hospital since his accident.
他从发生事故之后,一直在医院里。
注意:现在完成进行时可以和时间短语连用,也可以不连用,这一点就有别于现在完成时,因为后者与像for six days,since June,never等一些时间短语连用才能表示这类动作。不用这些时间状语时,现在完成时指的是完成了的一个动作。
B 用现在完成时表示的反复的动作,有时可以作为连续的动作用现在完成进行时表示:
I’ve written six letters since breakfast.早饭后我已经写了六封信。
I’ve been writing letters since breakfast.早饭后我一直在写信。
I have knocked five times.I don’t think anyone’s in.
我敲了五次门。我想屋里没有人。
I’ve been knocking.I don’t think anybody’s in.
我一直在敲门。我想屋里没有人。
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