I didn't need to spend money because it was not an important thing to buy.
I needn't have to stay outside very late last night.
I don't have to feel upset if I was not able to join you yesterday.
I musn't be sad if my parents said no the other day.
I must be thankful for all blessings that I received in the past.
She may want to stay more time in the library last Friday.
He might be present, had he known the plan last weekend.
