Past Modals and Modals of Deduction
Eva shouldn't have / didn't need to put on a party two days before New Year's Eve. Almost no one came.
shouldn't have
Why did I bother buying a big bottle of water? Samuel had already packed one. I didn't need to bother / shouldn't have bothered.
shouldn't have bothered
You must have made / must make more of an effort in class.
must make