I................ play videogames tomorrow. I don't have to work. (Positive. Possibility. Not sure)
might
They ........... be at home. I saw their car in the garage. (100% sure)
must
You............. enter the supermarket without a mask. (Negative. Prohibition/ don't have permission)
can't/ must not
He.............have arrived yesterday. (Positive. Possibility. Not sure.)
might
You ............ pay for the bag. It's free (not necessary)
don't have to
You.......... listen to the teacher. (positive. Advice)
should
People....... waste food. (Negative. Advice)
shouldn't/ should not
I was afraid that I..................be late. (Positive. Possibility. Not sure)
might
A: Can I play now, mum? B: No. You..................finish your work. (Positive. Obligation)
must/ have to
You................ drink alcohol. (Negative. Advice)
shouldn't
We ................. walk the dog. (Positive. Obligation)
must/ have to
You................ do more exercise. (positive. Advice)
should
I .................wash the car today. I washed it yesterday. (Negative. Not necessary).
don't have to
You............park here. (Negative. Prohibition/ don't have permission)
must not/ can't