文档介绍：The Present Perfect Tense
现在完成时
现在完成时的构成形式
have /has + Vpp
助动词
过去分词
否定
疑问
haven’t
hasn’t
Have you……?
Has he……?
finish--finished--finished
live--lived--lived
carry--carried--carried
stop—stopped--stopped
go—went—gone
see---saw—seen
forget—forgot--forgotten
现在完成时 ( have / has + v-ed )
, 常和 just, already, yet,等连用. (汉语常用“已经”“了”“过”来表达) 例如:
(1) Tom has just turned off the light.
(2) I have already finished my homework.
(3) They haven’t heard from Sam yet.
1. already : “已经” 一般用在完成时态的肯定句中。
eg: I have already seen the film．
already 与 yet 区别
2. already若用在疑问句中，常表示吃惊
意外的语气。此时already常放在句末。
eg: Have you finished already?
(我以为你没有做完，表示出乎意料。)
：“还”一般用在完成时态的
否定句和疑问句中。
eg: Have you found your ruler yet？
你已经找到尺子了吗？
现在完成时 ( have / has + v-ed )
, 常和 ever, never, before ，once, twice, three times(表次数)等词连用.
(汉语中常用“过”来表示) 例如:
(1) Have you ever visited the USA?
(2) I have never been to a swimming pool.
(3) He has flown to Los Angeles before.
现在完成时 ( have / has + v-ed )
, 常和表示延续的时间状语连用，如： since + 过去时间点, for + 时间段, recently, lately, these days, this week, in the past few days, during the last two weeks, so far, up to now, until now等 .
注意：动词多为延续性动词
They’ve known each other since 1995.
(2) Tony has studied Chinese for a year.
一段时间的表达方法有两种:
注意:for 和since 所引导的时间状语都表示一段时间.
He has been away since last week.
He has been away for seven days.
How long
for: + 段时间 for an hour for two weeks
since 点时间(过去的), since nine since two days ago
一般过去时态的时间状语从句
since you came since you got home.
现在完成时与瞬间动词
瞬间动词可以用于现在完成时，但不能和表示一段时间的状语连用。例如：
1. He has left.
2. He has left for three years.
3. He has been away for three years.
×
√
√
catch (get) a col