Would Is Use for?

Would is an auxiliary verb - a modal auxiliary verb. We use would mainly to: talk about the past. talk about the future in the past.

When use used to and would?

'Would' is only good for actions or situations that were repeated many times; 'Used to' is good for any action or situation that continued for a period of time in the past, including repeated actions or situations.

Would be used or will be used?

Many English learners get will and would confused because they're used in very similar situations. But they're not the same. The main difference between will and would is that will is used for real possibilities while would is used for imagined situations in the future.