structures for Questions / L+A / L-A / S+A / S-A

1). Questions with did

? : did yiu buy a car ?
L+A : YES'I  bought a car
L-A : NO, I didn't buy a car
S+A : YES I did
S-A : NO , I didin't (did not )

2). Questions with be ( past )

? : were you in class ?
L+A : YES I was in class
L-A : NAI wasn't in class
S+A : YES , I was
S-A : NO I wasn't (was not )