Question

英语的知识如：肯定句改成否定句,do的过去式……所有过去式；一般将来时；一般过去式；现在进行时；一般现在时；助动词怎么弄

Answer 1

ex:

1)改否定

I like him.

I don't like him.

I'm a student.

I'm not a student.

2)do 的过去式did

I went here 3 years ago.

I didn't go here 3 years ago.