I don't have enough money to pay this month's rent.
I (couldn't have/should have been saving money.
should have
I know Nick doesn't get along with Rob, but he didn't need to be so rude.
(Nick was rude/Nick wasn't rude)
Nick was rude
I was a mess at work today! I(might not have/ shouldn't have) stayed awake watching Netflix all night.
shouldn't have
Driving during a storm is dangerous.
You (must be/might have been) more careful.
Must be
My boyfriend/girlfriend forgot to answer my message. He/she (shouldn't have /might have) been busy.
Might have
Mary was supposed to cook dinner today
(Mary cooked dinner / Mary didn't cook dinner)
Mary didn't cook dinner
Matt you should have studied for your quiz!
(Matt didn't study / Matt studied)
Matt didn't study for his quiz
My father had to work early today.
(My father's boss told him to come to work early./ My father's boss didn’t tell him to come to work early.)
My father's boss told him to come to work early.