3. have been have been
4. Have eaten
5. has come
6. has gone
7. was has become
8. have worked
9. have made
10. have stayed
4) 1. havent
2. Why hasnt
3. How long has he
4. have bought
5. have learnt for
5) 1. have been
2. have gone have been
3. have been
4. has been
5. has been has been
6). Since for for since since for for for since
7). DACCC BDBDC CDDB 高二英语语法教学案--现在时
一般现在时
1.一般现在时的定义
一般现在时表示现在、经常或习惯的动作或状态和普遍现象、常识或客观真理
2.一般现在时的构成
是以动词的原形表示的,当主语为第三人称单数时,做谓语的动词原形后要加上词尾-s or es, 其构成方式如下:
一般情况 词尾加-s Reads, writes
以ch,sh,s,x,o结尾的词 词尾加-es Teaches,washes,guesses, fixes, goes
以辅音字母+Y 结尾的词 变Y为I,再加-es Tries, carries
3.一般现在时的基本用法
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