We use would / wouldn’t when we think of something that it’s not real, when we imagine a situation or an action.

eg. I would love to have a house in the mountains.

It wouldn’t be nice of you to do that.

It would be great to have a holiday right now.

 

• Sometimes would / wouldn’t is the past of will / won’t.

Dina: I promise I will help you. (present)

Mary: Dina said she would help me. (past)

• Somebody wouldn’t do something = they refuse to do it.

I tried to calm her down but she wouldn’t stop crying.

• We can use would to talk about things that happen regularly in the past

When I was a little girl, my grandma would make me homemade bread and chamomile tea in the morning.

 

Would have done is used when we imagine situations in the past (things that didn’t happen).

eg. I didn’t go to the party, I wouldn’t have enjoyed it.