Eal of detailed research is being performed in this area

?You ___don’t have to________come to the party if you don’t feel well.

?I don’t know where Kelly is. She __might/could be________ at her sister’s.

?You have passed all your tests. You _____must _____be very pleased with yourself.

?You ____must not_______smoke in your car, especially if there are children sitting in the back.

?You ___don’t have to______work this evening. I can do the tasks for you.

?John doesn’t need a calculator. He ___can_____do sums in his head.

?Passengers ___must not______open the door when the train is moving.

?It __could/ might________rain today. It’s getting cloudy already.

?I ___don’t have to________ pay for the tickets because I got them from Sam for free.

?My purse isn’t in my pocket. It___must be in my bag______.

77.