作业帮现在完成时的句型
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现在完成时的句型
现在完成时的句型
现在完成时的句型
现在完成时句型：主语 + have / has + 过去分词 (+ 其他)
Plenty of people have come.来了许多人.
We have looked all over for it.我们到处都找过它了.
Many of them have joined up.他们很多人都已参军了.
I learn from the paper that he has left.我从报上得知他已离开了.
I have warned him that it is not allowed.我警告过他这是不允许的.
The printers have missed out a whole line here.印刷工人在这里漏了一整行.
现在完成时用法：
现在完成时表示过去发生的某一动作对现在造成的结果或影响,也可指从过去开始延续到现在的动作或状态,常用的时间状语有：① now,today,tonight,this week / month / year 等; ② yet,already,just,recently 等; ③ since 引导的时间状语或时间状语从句；④ for 引导的表示一段时间的状语.
使用现在完成时注意：
(1) 由于现在完成时属于现在时态的范畴,它不能和表示过去的时间状语(如 last month,yesterday 等) 连用.
(2) 注意一般过去时与现在完成时的区别：一般过去时只单纯表示过去的动作或状态,和现在不发生联系,它可以和确定的表示过去的时间状语连用；而现在完成时表示某一完成的动作对现在造成的影响或结果,强调的是现在的情况,所以它不能和确定的表示过去的时间状语连用.试比较：
I have lost my pen.我把钢笔丢了.(意为还没找到)
I lost my pen yesterday.我昨天把钢笔丢了.(笔是昨天丢的,现在找到与否,没有说明)
1,when i arrived,the supper had already begun.
2,the haven't been catching the thief yet.
3,by the time he came,i had completed the work.
4,i haven't seen him lately.
5,where have you ...
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1,when i arrived,the supper had already begun.
2,the haven't been catching the thief yet.
3,by the time he came,i had completed the work.
4,i haven't seen him lately.
5,where have you been?
6,Jane has canceled her party because she's ill.
7,have you been playing tennis?
8,look!somebody has been that window.
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