Comparatives
Superlatives
Must or mustn't
Should or shouldn't
Should or must
100
Tokyo is ____ than Madrid. (expensive)
Tokyo is more expensive than Madrid.
100
The elephant is ____ land animal in the world. (heavy)
The elephant is the heaviest land animal in the world.
100
You ____ play music in a public library.
mustn't
100
You _____ eat more. You’re very thin
should
100
I mustn’t / should do more exercise, but I’m lazy
should
200
A city ______ is than a village (big)
A city is bigger than a village
200
The Gobi desert is one of _____ deserts in the world. (cold)
The Gobi desert is one of coldest deserts in the world.
200
You _____ shout in a hospital.
mustn't
200
He ____ play computer games; he’s got a lot of homework at the moment.
shouldn't
200
You must / shouldn’t tidy your room, now!
must
300
My brother ____ is than me (tall)
My brother is taller than me
300
The Amazon is ___ river in the world. (long)
The Amazon is the longest river in the world.
300
You ____ always tell the truth.
must
300
Lisa ______ study more because she wants to pass all her exams.
should
300
We mustn’t / should take photos in here – it’s not allowed.
mustn’t
400
Are tigers ______ than lions? (dangerous)
Are tigers more dangerous than lions?
400
That student is _______ person in the class (intelligent)
That student is the most intelligent person in the class
400
You _____ listen carefully when another person is talking
must
400
My father _____ shout when his football team wins. My baby brother is asleep!
shouldn't
400
You must / shouldn’t go to bed late, because you have school tomorrow.
shouldn’t
500
Is a cave house _____ than a normal house? (good)
Is a cave house better than a normal house?
500
The Vatican is _____ country in the world. (small)
The Vatican is the smallest country in the world.
500
You ____ use your mobile phone in class 
mustn't
500
We _____ spend more time together. I never see you.
should
500
All students must / shouldn’t finish their projects this week.
must