31753 learn how to use can and must

Targeted skill= learn how to use CAN/CAN’T and MUST/MUSTN’T

CAN / MUST
I-I read and I understand
1. “Can I open the window, please? It’s too hot in here.” The pupil asks the teacher.
2. “Yes you can”. The teacher answers.
3. Kevin loves foreign languages, he can read and write in English.
4. But he can’t say much in Spanish yet.
5. Pupils must pay attention and work hard in class.
6. They must be on time and respect everybody.
7. Pupils mustn’t chat or chew gum in class.
8. They mustn’t write on the tables.
II- I learn the new grammar rule





CAN and MUST are two modal auxiliaries. They are no verbs.
They are always followed by a verb base: can / must + VB
They are invariable
They can be used with all the personal pronouns
CAN expresses REQUEST sentence 1
PERMISSION sentence 2
CAPABILITY sentence 3
INCAPABILITY (can’t) sentence 4
MUST expresses

OBLIGATION: sentences 5 and 6
INTERDICTION (mustn’t) sentences 7 and 8

III-Exercise: fill in the blanks with either CAN / CAN’T , MUST / MUSTN’T
1.
2.
3.
4.
5.
6.
7.
8.
9.

My parent _____________ watch television late at night.
You _____________ remember your English lessons.
You _____________ ask the teacher questions if you don’t understand.
You _____________ shout in class.
Pupils _____________ forget their school things.
_____________ I put my paper in the bin, please?
Usain Bolt is an Olympic champion, he_____________ run faster than anyone.
Cigarettes are highly dangerous, so I _____________ smoke at all.
I am a little plump; I _____________ eat too much fatty food. I _____________ exercise
more.
10. You _____________ lead a horse to water, but you_____________ make it drink. (proverb)