内容正文:
Winter is coming.
If winter has already come, can spring be far behind?
专题03 现在完成时
定义
结构
动词变化
拓展补充
Contents
定义
1)表示过去发生或已完成的动作对现在造成的影响或结果;
e.g. I have already had lunch.
2) 表示过去已经开始并一直持续到现在的动作或状态。
e.g. The film has been on for ten minutes.
结构
I have already had lunch.
主语
+have/has
+过去分词
关键词?
三单has,非三单have
already 已经
(否定 yet)
关键词
ever曾经
(否定never从不)
just
刚刚
before
在……以前
关键词
for+时间段
长达……
since+时间点
自从……到现在
关键词
recently
最近
so far,up to now
至今
一.already和yet的区别(观察并得出结论)
1.Tom has already finished his work.
2.Tom has finished his work already.
3.Tom hasn’t finished his work yet.
4.Has Tom finished his work yet?
already常用于 或 ;yet常用于 或 。
肯定句中
句末
一般疑问句句末
否定句末
---Has he finished his homework ?
---No, he hasn’t finished it ______ .
A. already B. ever C. yet D. before
C
易错易混点
易错易混点
二.for和since的运用(观察并得出结论)
1.He has stayed here for 3 hours.
3.He has stayed here since 3 o’clock.
2.He has stayed here since 3 ho