4. • I can open the door because I have the key.
It is used to talk about ability =
When we talk about something possible
We use “ ”:
5. • I can’t open the door because I don’t have the key.
For inability =
When we talk about something impossible
We use “ ”:
6. 1. You didn’t sleep last night. You must be really tired now.
2. His leg is broken! It must hurt really bad.
3. Students must come on time.
For certainty =
When we are sure/certain about something
We use “ ”:
It hurts!
To talk about obligation
7. •Teacher: Why is Ahmed absent?.
Student: I don’t know. He may have a fever.
To talk about uncertainty =
When we are not sure about something
We use “ ”:
8. Some Basic Rules
Modal verbs:
1- usually come before another verb:
I must go to the library now.
2- are used with the infinitive but without the ‘to’
He can read French.
And not :
He can to read French.
9. • Form:
You must be tired:
Subject + Modal + Verb (infinitive) + …
• Use:
1. Must: Certainty = When we are sure/certain about something
-> You didn’t eat your breakfast. You must be hungry
2. May: uncertainty = When we are not sure about something
-> I don’t know where he is. He may be in the Kitchen
3. Can: ability = When we talk about something possible
• -> I can open the door because I have the key.
• 3. Can’t: inability = When we talk about something impossible
• -> I can’t see without my glasses
Grammar Modals
10. Fill in the gap with “must”, “can”, “can’t” or “may”
1. He ________speak English very well now
2. I'm not sure, but he _________ be absent tomorrow
3. This restaurant ________ be a good one; it’s always empty.
4. He injured his leg while playing football; his parents _______ be worried
5. My brother is a mechanic, he _______ fix your car.
6. There are some clouds in the sky, it __________ rain tomorrow
7. I eat a whole chicken by myself, I’m full and I _______ eat anymore
8. You have been working all day long, You _____ be very tired
9. You ________ have a good mark in the exam without studying.
10. This jacket is good quality; it ______ be very expensive
can
may
Can’t
must
can
may
can
must
can’t
must