1、否定句：You don't write a letter to Jim.
一般疑问句：Do you write a letter to Jim?
对划线部分提问：Whom do you write a letter to?
现在进行时：You are writing a letter to Jim.
现在时的否定句：You are not writing a letter to Jim.
2、否定句：I don't do my homework at home.
一般疑问句：Do you do your homework at home?
对划线部分提问：Where do you do your homework?
现在进行时：I am doing my homework at home.
现在进行时的否定句：I am not doing my homework at home.
3、Miss Green doesn't come from the U.K.
Does Miss Green come from the U.K.
Where does Miss Green come from?
Miss Green is coming from the U.K.
Miss Green isn't coming from the U.K.
4、There aren't three books on the desk.
Are there three books on the desk?
Where are three books?
你只提供了五种变法,没有六种,而第四题我个人认为没有什么时候现在进行时.