Fill in the blank with a modal auxiliary indicating necessity.
Rahul _____ submit a letter authorising him to collect Samir’s mark sheet.
Will
Must
Can
Would
Rahul must submit a letter authorising him to collect Samir’s mark sheet.
Fill in the blank with a modal auxiliary showing certainty.
I _______ have submitted the cheque to the bank in the morning.
Fill in the blank with a modal auxiliary indicating duty. You _______ to serve the country like your father did years ago.