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Must | Can't | May | Might | Unit 20 Grammar | Neb Compulsory English Class 11 by Suraj Bhatt Neb English Support
Must | Can't | May | Might
Must, Can't and May, Might
Main Rule:
If the sentence begins with the following impressions:
I'm sure.................
Obviously..............
I'm confident..........
I'm convinced............
We have to use "must" for positive questions' answers.
We have to use "can't" for negative questions' answers.
Examples:
I'm convinced he is coming.
Answer:
He must be coming.
I'm sure she is not coming.
Answer:
She can't be coming.
If the sentence begins with the following impressions:
Perhaps...........
Maybe.............
I doubt...............
It is possible that.................
We have to use "may / might" for positive questions' answers.
We have to use "may not / might not" for negative questions' answers.
Examples:
Perhaps she went to market.
Answer:
She might have gone to market.
I doubt she was at home.
Answer:
She might not have been at home.
Basic Tense Change
Simple Present Tense
Structures:
Subject + v1/V5 + object.
Or...Subject + is/am / are + noun / adjective.
Answer:
For both positive & negative questions' answers:
Subject + must / can't / may (not) / might (not) + + be / V1 + object.
Examples:
I'm sure he goes to market.
Answer:
He must go to market.
I'm confident he doesn't come to meet me.
Answer:
He can't come to meet me.
I doubt he dances in school.
Answer:
He might dance in school.
It is possible that she doesn't carry a gun.
Answer:
She might not carry a gun.
I'm confident he is a lawyer.
Answer:
He must be a lawyer.
I'm sure they aren't players.
Answer:
They can't be players.
Perhaps she is greedy.
Answer:
She might be greedy.
I doubt she isn't buying a new car.
Answer:
She may not be buying a new car.
Present Continuous Tense
Structure:
Subject + is / am / are + v4 + object.
Answer:
For both positive & negative questions' answers:
Subject + must / can't / may (not) / might (not) + be + v4 + object.
Examples:
I'm sure he is running on the ground.
Answer:
He must be running on the ground.
Obviously she isn't supporting her.
Answer:
She can't be supporting her.
Perhaps they are playing ice hockey.
Answer:
They may be playing ice hockey.
It's possible that she isn't coming to the court.
Answer:
She might not be coming to the court.
Present Perfect Tense / Simple Past Tense
Structures:
Subject + have / has + v3 + object.
Subject + v2 + object.
Answer:
For both positive & negative questions' answers:
Subject + must / can't / may (not) / might (not) + have v3 + object.
Example:
I'm sure John has arrived home.
Answer:
John must have arrived home.
I'm convinced she hasn't done her work yet.
Answer:
She can't have done her work yet.
Perhaps she has called you.
Answer:
She might have called you.
It's possible that she hasn't created a nuisance.
Answer:
She may not have created a nuisance.
I'm sure he went home.
Answer:
He must have gone home.
I'm convinced he didn't steal money.
Answer:
He can't have stolen money.
Perhaps they called you.
Answer:
They might have called you.
Maybe she didn't meet him.
Answer:
She might not have met him.
Present Perfect Continuous / Past Continuous Tense
Structures:
Subject + have / has been + v4 + object.
Subject + was / were + v4 + object.
Answer:
For both positive & negative questions' answers:
Subject + must / can't / may (not) / might (not) + have been + v4 + object.
Examples:
Obviously she has been cutting grass.
Answer:
She must have been cutting grass.
I'm sure he hasn't been doing his job.
Answer:
He can't have been doing his job.
Perhaps Simon has been talking to the doctor.
Answer:
Simon might have been talking to the doctor.
I doubt Jack hasn't been repairing his bike.
Answer:
Jack might not have been repairing his bike.
I'm sure they were coming home.
Answer:
They must have been coming home.
I'm convinced he wasn't flirting with girls.
Answer:
He can't have been flirting with girls.
Perhaps he was kissing his fiancee.
Answer:
He may have been kissing his fiancee.
Maybe they weren't making noise.
Answer:
They might not have been making noise.
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