现在完成时未完成的句子造句？7. 现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.We have had four texts this semester.=== 现在完成时的“完成用法”和“未完成用法”1.现在完成时的"完成用法"现在完成时的"完成用法"指的是动作发生在过去某一时刻并已结束，但该动作对现在产生了影响，那么，现在完成时未完成的句子造句？一起来了解一下吧。
现在完成时是英文时态的一种
现在完成时的用法
have(has)+过去分词(done)
1.现在完成时用来表示现在之前已发生过或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在.
I have lost my wallet.(含义是:现在我没有钱花了.)
Jane has laid the table.(含义是:已可以吃饭了.)
Michael has been ill.(含义是:现在仍然很虚弱)
He has returned from abroad. (含义是:现在已在此地)
2. 现在完成时可以用来表示发生在过去某一时刻的,持续到现在的情况,常与for,since连用.
Mary has been ill for three days.
I have lived here since 1998.
3. 现在完成时往往同表示不确定的过去时间状语连用,如already, yet, just, before, recently, lately等:
He has already obtained a scholarship.
I haven't seen much of him recently (lately).
We have seen that film before.
Have they found the missing child yet
4. 现在完成时常常与表示频度的时间状语连用,如often, sometimes, ever, never, twice, on several occasion等:
Have you ever been to Beijing
I have never heard Bunny say anything against her.
I have used this pen only three times. It is still good.
George has met that gentleman on several occasions.
5. 现在完成时还往往可以同包括现在时间在内的时间状语连用,如now, up to these few days/weeks/months/years, this morning/week/month/year, now, just, today, up to present, so far等:
Peter has written six papers so far.
Man has now learned to release energy from the nucleus of the atom.
There has bee too much rain in San Francisco this year.
The friendly relations and cooperation between our two countries have been enhanced in the past few years.
Up to the present everything has been successful.
6. 现在完成时表示现在之前业已完成的动作,虽然其效果或影响仍然存在但已不再继续,但是有一些现在完成时的句子,在后面加上for+一段时间,则现在完成时的动作就表示延续性.
Thomas has studied Russian. (现在不再学俄语)
Thomas has studied Russian for three years. (=Thomas began to study Russian three years ago, and is still studying it now.(同第2点用法第一个例句)
7. 现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.
We have had four texts this semester.
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现在完成时的“完成用法”和“未完成用法”
1.现在完成时的"完成用法"
现在完成时的"完成用法"指的是动作发生在过去某一时刻并已结束，但该动作对现在产生了影响，与现在情况具有因果关系。
1、表示过去所发生的动作或事情对现在的影响或产生的结果，着眼点在现在。现在完成时时常与不确定的过去时间状语连用，表示“已发生”或“未发生”，如：yet,just,before,recently,once,lately,of late等；也同表示频度的时间状语连用，如：
often,ever,never,sometimes,twice,on several occasions等；也同包括现在时间在内的时间状语连用，如：now,today,this morning,this month,this year等。但不能同特定的过去时间状语（in 1995,last year等）连用。
例句：
He has lost his wallet.他的钱包丢了。
Why haven't I seen you all these months?我怎么这么多月没看见你呢？
We've had too much rain this year.今年雨水太多。
2、表示一个从过去某个时间开始，延续到现在，并可能延续下去的动作。常同表示包括现在时间在内的一段时间的状语连用，如：so far,up to now,since last year,for a long time,all my life,these few days等。
一、现在完成时的两种基本用法
1、已完成用法(影响性用法)。该用法的现在完成时表示一个过去发生的动作在过去已经完成，并且这个过去发生并完成的动作对现在有影响或结果，同时说话强调的或感兴趣的就是这个影响或结果：
He has left the city. 他已离开这个城市。(结果：他不在这个城市)
Someone has broken the window. 有人把窗户打破了。(结果：窗户仍破着)
Have you seen my bag? 你看到我的手提包了吗?(结果：你知道它在哪里吗?)
2、未完成用法(持续性用法)：该用法的现在完成时表示一个过去发生的动作并未在过去完成，而是一直持续到现在，并且有可能继续下去(也可能到此结束)：
Have you waited long? 你等了很久吗?
We have been busy this afternoon. 今天下午我们一直很忙。
The temperature has stayed hot this week. 这星期天气一直很热。
【注】除以上用法外，现在完成时还可表示过去的重复动作甚至将来动作：
He has always gone to work by bike. 他总是骑自行车上班。
http://wenku.baidu.com/view/4eebcebcc77da26925c5b035.html
1.现在完成时常用的时间状语有lately，recently，just，already，yet，up to now，till now，so far，to this day，in the past few years/months/weeks/days，over the past few years，during the last three months，for the last few centuries，through centuries，throughout history等。
2.在时间状语从句中，谓语动词可以用现在完成时代替将来完成时。例如：
Mother won’t let her watch TV until she has finished her homework.母亲要到她做完作业才让她看电视。
The dinner party will begin after all the guests arrive/have arrived.所有的客人到了以后，聚餐就开始了。
3.has/have been to与has/have gone to的区别。has/have been to表示“曾去过”，说明有某种经历；has/have gone to表示“已去某地(在途中或已经到达目的地)。
以上就是现在完成时未完成的句子造句的全部内容，否定句1 she hasn't come yet. 她还没来。2 They haven't finshed the job yet.她们尚未完成该项工作。 3 I have not seen the the movie yet.我还没有去看那部电影。4I haven't eaten yet.我还没有吃。5 The rain hasn't stopped yet. 雨还没有停。
