I bought a new bike yesterday.(改为否定句和一般疑问句)

问题描述:

I bought a new bike yesterday.(改为否定句和一般疑问句)

I didn't buy a new bike yesterday.
Did you buy a new bike yesterday?

I didn't buy a new bike yesterday . Did you buy a new bike yesterday?

I didn't buy a new bike yesterday.
Did you buy a new bike yesterday?