MODAL VERBS

Must -to express obligation
Children must go to school (it’s the law)
You have to do your homework tonight (the teacher says)
Have to – to express necessity for personal reasons.
I have to do my homework every day
Need – is used to express necessity
You need to buy some food, the fridge is empty
Mustn’t - to express prohibition
He mustn’t arrive late for work.
CHOOSE THE CORRECT OPTION
a) It’s raining. You ……to take an umbrella with you.
1.-need
2.- mustn’t
3.- must
b) She …….. pay me the money.
1.- must
2.-have to
3.- has
c) Look! It’s getting late. I …….. go home now.
1.- need
2.- must
3.- have
d) Children ………. obey their parents and teachers.
1.- mustn’t
2.- have
3.- have to
e) We ……… to get to school early tomorrow.
1.- have
2.- must
3.- mustn’t
f) George …….. to pay his electricity bill today.
1.- must
2.- has
3.- mustn’t
g) We ……… to buy any vegetables today.
1.- have
2.-don’t have 3.- must
h) That boy …….. walk in the puddles.
1.- mustn’t
2.- need
3.- don’t have to
i) My uncle ……… to walk the dog twice a day.
1.- have
2.- must
3.- has
j) We ……… walk on the grass. It’s forbidden.
1.- must
2.- mustn’t
3.- have
k) You …….. brush your teeth after eating.
1.- has to
2.- mustn’t
3.- must
l) Leonardo ……… finish the exercises.
1.- have to
2.- has to
3.- need
m) My grandmother ……..take this medicine in the morning.
1.- need to
2.- needs to 3.- have to
n) I ……….. park my car here. I may get fined.
1.- must
2.- have
3.- mustn’t
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REWRITE THESE SENTENCES USING
must/have to/ need
1.- It’s obligatory to pay before you go in.
You………………………………………………………………
2.- It’s forbidden to smoke in the classrooms.
You …………………………………………………………..
3.- It’s not necessary to buy all the books on the list.
You ……………………………………………………………
4.- It’s forbidden to use dictionaries in the exam.
You………………………………………………………….
5.- It’s necessary to wear formal clothes
You …………………………………………………………
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