Fill in the blank with a modal auxiliary showing past probability.
We ______ have reached the venue on time if the car had not broken down.
May
Could
Will
Should
We could have reached the venue on time if the car had not broken down.
Fill in the blank with a modal auxiliary showing possibility. She _____ be in the library, but I am not sure if she has your book.
Fill in the blank with a modal auxiliary showing certainty.
I _______ have submitted the cheque to the bank in the morning.