英语课程学习 语法 肯定句 否定句 疑问句

英语课程学习，语法，肯定句，否定句，疑问句。以下这种结构的肯定句、否定句、疑问句及简短回答可以表示如下：

肯定句：I（We,You,Theey）have done it. He(she)has done it.

否定句：I（We,You,They）haven done it.He(she)hasn done it.

疑问句：Have I(we,you,they)done it? Has he(she)done it?

简短回答：Yes,I(we,you,they)have. Yes,he(she)has. No, I(we,you,they)haven . No,he(she)hasn .