Would.

📘📕Would is a past-tense form of will.
If you are writing about past events, you can use it to indicate something that was in the future at that point in time,

The negative form 👉 wouldn’t.

The subject and would change position to form questions. 👇

📚Would that be a good idea?

✅she wouldn’t be any help, would she ?

📕We often use would (or the contracted form’d) in the main clause of a conditional sentence when we talk about imagined situations:

✅If we went to Chile, we’d have to go to Argentina as well. I’d love to see both.

📕Conditionals
Habitual actions in the past

✅We use would to refer to typical habitual actions and events in the past. This is usually a formal use and it often occurs in stories (narratives):

✅I had a friend from Albany, which is about 36 miles away, and we would meet every Thursday morning and she would help us.

📕We use would to talk about the future in the past. The speaker looks forward in time from a point in the past ..

✅When I was young I thought that in years to come I would be really tall.

📘📕We use would to talk about willingness in past time situations. We usually use the negative form wouldn’t in this case:

✅The CD wasn’t working so I brought it back to the shop but they wouldn’t give me my money back because they said the box had already been opened.

📕📘We can use would as a more formal or polite alternative to will in requests. We often use the phrase would you mind + -ing in polite requests.

📕📘Will and would can both refer to willingness.
We use will for present and future time andwould, usually in the negative, for past time:

✅John will carry your suitcase. It’s far too heavy for you. (present)

✅The taxi driver wouldn’t take more than four in the car. (past)