哪些主语属于第三人称单数
一般现在时中，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。其实主语是第三人称单数，主要有以下几种情况：
1.不可数名词作主语
Eg.: Some water is in the gla.
2.单个的可数名词作主语
Eg.: The girl is American./ My watch is on the dreer.
3.he, she, it 等代词单独作主语
Eg.: He is on the tree.
4.单个的人名、地名或称呼作主语
Eg.: Tony is a doctor./ Uncle Li speaks a little English./ Ningbo is a beautiful city.
5.指示代词this, that 等做主语
Eg.: This is a pear.That is an apple.
6.everyone, everything, something, nobody, nothing等不定代词作主语
Eg.: Is everyone here today?
7.单个数字作主语
Eg.: \"8\" is a good number in China.
动词的第三人称单数
变化规律
1.一般情况下， 动词+ s getstake takes
2.以s, sh, ch, x.o 结尾的动词，动词+ es
Eg.: teach teachesfixesgogoes
3.辅音字母+ y 结尾的动词，变y为i + es
Eg.: studystudiestry tries
除上述规律外，还应注意下面三点：
1.动词have, 遇到主语是第三人称单数时，要用has；动词be的第三人称单数形式是is
2.含有动词第三人称单数形式的句子变否定句，要用 doesn\'t + 动词原形
Eg.: He goes to school.He doesn\'t go to school.
3.对含有动词第三人称单数形式的句子要提问时，要用助动词does
When does she go home every day?
4.改为一般疑问句时，does 提前
Eg.; She goes home today.Does she go home today?
