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.