2. a. must
b. have to
c. must
d. have to
e. do / have to
3. a. have to
b. can
c. can
d. can
e. can
f. can't
g. can
h. have to
i. students don't have to leave the school premises for lunch.
j. teachers can't use their mobiles in class.
4. II. they may be famous
III. his family might be from France
IV. she may be sick
5. a. must
b. have to
c. should
d. might
e. don't have to
f. can
