(共12张PPT)
单元语法活学巧练
Unit 8 Have you read Treasure Island yet ?
必
●
现在完成时(一)
1.概念及构成
(1)现在完成时表示过去发生或已经完成的动
作对现在造成的影响或结果,也可表示过去
已经开始,一直持续到现在的动作或状态。
其结构为“助动词have/has十动词的过去分
词”。
(2)各种句型结构如下:
①否定句:主语十haven't/hasn't十动词的过
去分词十其他.
②一般疑问句:Have/Has十主语+动词的
过去分词十其他?
③特殊疑问句:特殊疑问词十have/has十主
语十动词的过去分词十其他?
成的影响或结果。常与yet,already,just,
ever,never等副词连用。
eg:Have you finished your homework yet
你还没完成家庭作业吗?
The children's parents have just come back
from work.孩子们的父母刚下班回来。
(2)某些动词的现在完成时可表示过去某一时
间开始并一直持续到现在(包括“现在”在
内)的动作或状态。表示持续动作或状态的
动词多是延续性动词。
eg:China has already made great progress in
science and technology.中国在科技方面己
经取得了巨大的进步。
(注意】already常用于肯定句中,一般用在句子
中间或句末。yet用于疑问句和否定句中,常用
于句末。
I、单项选择。
(D)1.(广东)Miss Brown,we
cleaning
our classroom.Can we go home now
A.finish
B.finishing
C.are finished
D.have finished
(A)2.(成都)I
the book Little Women
but I'll let you read it first.
A.haven't read B.don't read
C.won't read
D.read
(C)3.(上海)This medicine
millions of
people's lives since it was put into use.
A.is saving
B.will save
C.has saved
D.had saved
(D)4.(泸州)Jenny,when did you move here
I
here for three years.
A.lived
B.moved
C.have moved
D.have lived