Modal verbs:

Modal verbs are used with other verbs to change their meaning.
Can, cannot, may, should, must and ought are modal words.
Can and cannot express ability.
May and may not express possibility.
Should, ought and must express what is right or best thing to do.

Fill in the blanks with the correct kind of adverb:
Options:
must should must must must must
can may should should can  
cannot can can may can  
 1.  __________ you drive a car?
 2.  The house is collapsing. You  __________ get out at once.
 3.  If you want to pass, you  __________ study hard.
 4.  __________ I use your telephone?
 5.  Snakes  __________ fly. They have no wings.
 6.  We  __________ help the poor whenever we can.
 7.  We  __________ not talk loudly in the library.
 8.  The guest  __________ arrive soon.
 9.  He  __________ speak French, although he is an Indian.
10.  We  __________ keep the school clean.
11.  People  __________ not smoke in the lift.
12.  The engine is too hot. The car  __________ break down soon.
13.  __________ you hear me clearly?
14.  The runners are very thirsty. They  __________ have a drink.
15.  __________ I borrow your book?
16.  We  __________ wash our hands before every meal.