I ____ in Lijiang for two weeks when I went to Yun Nan last year.
A. have been B. had been C. stay D. stayed
D
在一般现在时的肯定句中，当主语为非第三人称单数时，谓语动词用原形；
当主语为第三人称单数时，谓语动词用单数第三人称形式。
| 规则 | 动词原形 | 第三人称 单数形式 | |
| s | 一般在词尾加s（读音规则： 清清浊浊元浊， 在清辅音后读清辅音/s/, 在浊辅音和元音后读/z/） |
stop take clean play grow |
stops/s/ takes/s/ cleans/z/ plays/z/ grows/z/ |
| es | 以,x,ch,sh,或o结尾的动词 加-es（读/iz/） |
pass fix wash watch do |
passes fixes washes watches does |
| ies | 以辅音字母 加y结尾的动词，变y为ies(读/iz/) |
fly carry hurry |
flies carries hurries |
一般现在时，当主语是第三人称单数时，谓语动词要用第三人称单数形式
主语是第三人称单数有以下几种情况：
（1） 不可数名词做主语：
Some water is in the glass
（2） 单个的可数名词做主语：
The girl is Chinese. My watch is on the dresser.
（3） He ,she , it 等代词单个做主语:
He is in the tree. She likes her family very much.
（4） 单个的人名，地名或称呼作主语：
Mary is a doctor. Uncle Li speaks a little English.
Changchun is a beautiful city.
（5） 指示代词this, that 等作主语:
This is a pear. That is an apple .
（6） Everyone, everything ,something, nobody, nothing.等不定代词作主语时
Is everyone here today? Everything is ok .
（7）单个数字作主语时：
”8” is a good number in China.
动词单数第三人称形式的一般现在时的句子的否定句、疑问句及特殊疑问句。
否定句：
在主语的后面实义动词前加doesn’t(注意实义动词应恢复原形。)
主语（单三）+doesn’ + 动词原形+其他
Jim likes football变否定： Jim doesn’t like football
He has lunch at school. 变否定：He doesn’t have lunch at school.
一般疑问句及答语，在句子前面加助动词does. 实义动词恢复原形
Does +主语（单三）+ 动词原形+其他
Does your father work ? Yes, he does. /No, he doesn’t
特殊疑问句：特殊疑问词+一般疑问句
特殊疑问词+ does +主语（单三）+ 动词原形+其他
Where does a bird live ?
How does she go to school？
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