陈述句变一般疑问句的方法：
1）对于助动词、情态动词、be动词作谓语的,掉换主谓.如：
He's a teacher.
Is he a teacher?
He can swim.
Can he swim?
He'd like to go there.
Would he like to go there?
2）对于实意动词作谓语的,动词原型借助do,三人称单数借助does,过去式借助did,加在句首,再把谓语改为动词原型.如：
I like him.
Do I like him?
He likes me.
Does he like me?
I liked him.
Did I like him?
特殊疑问句：
先改一般疑问句,去掉要提问的成分,再在句首加相应疑问词.如：
I will go there by bus.
Will I go there by bus?