General
Positive
Negative
Interrogative
100

What is 'can' used for?

Express ability

100

I ________ play the guitar and the piano. 

CAN

100

He ________ visit me last week because his car didn't work.

COULDN'T

100

I don't know the rules in this school. _________ (wear, I) a uniform? Is it obligatory?

MUST I WEAR

200

What is 'could' used for?

Express ability in the past

200
When I was little, I _______ run 10km but now I ______.

COULD, CAN'T

200

They _________ go to bed late if they want good grades.

SHOULDN'T

200
I don't know what to do. _______ (I, text) him?

SHOULD I TEXT

300

What is 'must' used for?

To express obligation

300
You _________ listen to your parents when they give you advice. They want what's best for you.

SHOULD

300

I used to be very good at Maths, but now I ________ understand the problems.

CAN'T

300

Wow, you can play football very well! ________ (you, do) it when you were young, too?

COULD YOU DO

400

What is 'mustn't' used for?

To express prohibition

400

They _______ be quiet when the teacher is speaking. They are not allowed to talk.

SHOULD

400

You _______ smoke inside bars. It's prohibited.

MUSTN'T

400
I don't know her very well. __________ (she, swim) faster than me?

CAN SHE SWIM

500

What is 'should' used for?

To give advice

500

You ________ study for your exams, and for that, you _______ have an organized timetable.

MUST, SHOULD

500

When I was young I ________ read a book in a day, and now I still _______ do it. It's too difficult.

COULDN'T, CAN'T

500

________ (he, ride a bike) when he was at school or _________ (he, only, do) it now?

COULD HE RIDE A BIKE, CAN HE ONLY DO

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