一般疑问句：把Be动词（am,is,are)提前.
例：I am a boy.改为：Are you a boy?
She is a good student.改为：Is she a good student?
否定句：Be动词后+not
例：I am a boy.改为：I am not a boy.
She is a good student.改为：She is not （或用is not 的缩写：isn't ）a good student.
单数：把are改为is,有some把some改为a或an.并并把名词后的s或es去掉：
例：I have some apples.改为：I have an apple.
There are two fishes(鱼的复数形式）in the box(盒子).改为： There is a fish in the box.
一般疑问句并作否定句回答：
例：Are you a boy?答：No,I'm not.
Is she a good student?答：No,she isn't.
对划线部分提问:
例：This is a (key).答：What is this?
The key is (on the desk).答:Where is the key?
就这些了, 希望对你有帮助!