新概念英语第一册语法总结 时态：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1. 一般现在时表示一般性、经常性的动作或一般性事实。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notHe 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.含有一般动词的句子第三人称单数
