Would like to + infinitive
Hello everyone!
Are these sentences correct?

Positive Form
I would like to buy a new car.
I'd like to buy a new car.

Negative Form
I would not like to buy a new car.
I wouldn't like to buy a new car.

Question Form
Would you like to buy a new car? Yes, I would. No, I wouldn't.

Is it correct to use the grammar (would like to + infinitive) in the negative sentences
and is it correct to say the short answer to the question Would you like to buy a new car? Yes, I would. No, I wouldn't.

Question

Would like to + infinitive
Hello everyone!
 Are these sentences correct?

Positive Form
I would like to buy a new car. 
I'd like to buy a new car.

Negative Form
I would not like to buy a new car.
I wouldn't like to buy a new car.

Question Form
Would you like to buy a new car? Yes, I would. No, I wouldn't.

Is it correct to use the grammar (would like to + infinitive) in the negative sentences 
and is it correct to say the short answer to the question Would you like to buy a new car? Yes, I would. No, I wouldn't.

Answer

'Yes' to both those questions. All your sentences are perfect. Well done!

Answer

Hi there,

It`s all correct. However, I would like to point out a few things.
When we talk about structure it`s best to call something like this the infinitive : TO BUY
so the structure of a negative sentence is `wouldn`t like + infinitive` = wouldn`t like to buy 
Also, it sounds much more natural to say : I don`t want to buy a new car. This sounds more natural to my American ears when expressing a desire. 
I hope it helps.:)