小升初英语知识点复习:一般现在时
英语中的时态一共有八种，它们是：一般现在时、现在进行时、一般过去时、现在完成时、一般将来时、过去进行时、过去完成时、过去将来时。
今天我们所要讲的就是第一种： 一般现在时表示一般性，经常性的动作或一般性事实。
1、含有be动词的句子
he is a teacher.
the girl is very beautiful.
tim and jack are students.
★变疑问句将be动词移到句首
is he a teacher?
is the girl very beautiful?
are tim and jack students?
★变否定句在be动词后面加not
he is not a teacher.
the girl is not very beautiful.
tim and jack are not students.
★肯定回答及否定回答
yes, he is. / no, he is not.
yes, she is. / no, she is not.
yes, they are. / no, they are not.
2、不含有be动词的句子，即含有一般动词的句子。
(1)第三人称单数及单数名词
he likes books.
she likes him.
the dog likes bones.
★变疑问句在句首加does, 动词变为原型
does he like books?
does she like him?
does the dog like bones?
★变否定句在主语及动词之间加doesn't, 动词变为原型，原句中的动词不再有第三人称变化。
he doesn't like books.
she doesn't like him.
the dog doesn't like bones.
★肯定回答及否定回答：
yes, he does. / no, he doesn't.
yes, she does. / no, she doesn't
yes, it does. / no, it doesn't.
注意：第三人称单数形式一般在动词后面加s，不要和名词复数混淆，变否定句或疑问句时名词复数没有任何变化。
(2)其他人称及复数名词
i want to have a bath.
we have some meat.
the students like smart teachers.
★变疑问句在句首加do
do you want to have a bath?
do we have any meat?
do the students like smart teachers? ★变否定句在主语和动词之间加don't. you don't want to have a bath. we don't have any meat. the students don't like smart teachers. ★肯定回答及否定回答 yes, i do. / no, i don't. yes, we do. / no, we don't yes, they do. / no, they don't.