Question

WHAT IS THE DIFFERENCE BETWEEN WOULD AN HAD. HOW WE KNOW HERE WE USE WOULD OR HAD?

Answer 1

would must be followed by an infinitive without to ( eg. I would have gone).

had must be followed by an object (a noun phrase, e.g. I had a little lamb) or by a verb's past participle.

in past if you are talking about future then use would and if the action is already completed in past than use had