现在完成时
already （“已经”，用于肯定句中，放在have /has之后或句尾）；
yet （“仍然”“还”，用于疑问句或否定句的句尾）
just（“刚刚”，放在have /has之后）；
before（“以前”，放在句尾）；
ever（“曾经”，放在have /has之后）
never （“从没有”，在have /has之后）
例句：
1.Our teacher has just left.
2.We have studied English already.
3.I have not finished the homework y et.
4.He has n ever b een to Beijing before.
例：I have just turned off the light. 我刚刚把灯关上。（结果是灯已经关上了）
She has lost her bike.她把自行车丢了。（影响是他现在没有自行车骑了）
The rain has stopped now.雨已经停了。（结果是我们可以出门了）
I have already read the book.我已读过这本书了。（结果是已知道这本书的内容）
She has had a good education.她受到过良好的教育。（影响是她文化水平高，有修养）
2.某个动作从过去已经开始，一直持续到现在，还有可能持续到将来.（也可能不继续下去），常同包括现在在内的时间状语连用，如：
today, now, this week, this morning, these days, this afternoon, recently, so far等
动作的持续性要通过一段时间来表示一段时间的表达方法有两种:
for: +一段时间for a year for two weeks for three years
Since +过去的某一时刻, since nine since last week
Since +一般过去时态的时间状语从句since you came ; since you got hom e.
例：We have had much snow this winter. 今年冬天多雪。
She has taught in the school for ten years.她在这所学校教书已经10年了。
I haven't eaten anything since breakfast.我从早饭起就一直没有吃东西。
We have been busy this morning.今天上午我们一直很忙。
我很好 歌词I have known her since we were children.我从小就认识她。
I haven't seen John today.我今天没有见到约翰。
江门娱乐It has rained a lot these days.这些天多雨。
注意：结束性动词不能和表示一段时间的时间状语连用，但是它们可以转换成相应的延续性动词.
任静1.直接用延续性动词
buy– have；catch(get) a cold –have a cold；borrow—keep；become—be；put on-- wear
2.转换成be+名词
join the army – be a soldier；join the Party –be a Party member；
go to school– be a student
3转换成be+形容词或副词
die—be dead；finish – be over；begin—be on；leave—be away ；fall sleep – be asleep close – be closed come to/ go to/arrive at(in)+某地—be in(at) +某地十二月你好
4.转换成be+介词短语go to school– be in school ；get up_ be up；
) 表示从过去某一时间到说话时这段时间中反复发生的动作或多次动作的总和，常同频度副词always, often, seldom, never等连用
例：He has done a lot of work in the past two years. 在过去两年中他做了许多工作。巴望
I have learned about two hundred English words this morning.本月我学了大约200个英语单词。
我想长高I have been to the Great Wall twice.我曾经去过长城两次
It has rained every day this week.这个星期天天下雨。
She has always walked to school.她一直步行去学校。
I have never seen such a beautiful bird.我从没见过这么美丽的鸟。
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