Obligation
Advice
Permission
Advice
Permission
What are you doing? You _____ be here!
Must not
It _____ rain tonight.
A) Must
B) Should
C) Might
D) Have to
C
He is amazing, he ___ speak five languages, including Chinese.
can
The dog just got out, it ________ gone far.
can't have
Rock climbing _____ be dangerous.
can
You _____ be an expert to use the basic functions of program.
_____ you open the window, please? It's hot in here. (Polite request)
Could
She's seven years old, but she ___ read yet. Her parents are getting her extra lessons.
can't
The weather ______ (be) any worse! (past negative possibility)
couldn't have been
Sorry, we ____ sell knives to under-18s.
can't
You _____ wear warm clothes to go skiing.
should / ought to
___ I speak to Mr. Smith, please?
(Formal polite request)
May
______ you swim when you were ten?
Could
Andrew _____ (go) to Cambridge University, but he decided to travel instead. (past possibility)
could have gone
Al ____ work tomorrow so he can't come.
has to
(formal permission)
You ____ start when the bell rings.
May
____ you like some pizza?
Would
The dog just got out, it ________ gone far.
can't have
I ______ (buy) bread but I didn't know we needed it.
possibility
could have bought
Guests _____ not make noise after 10 p.m.
must
We _____ go to the meeting. Why didn't you go?
Had to
They ____ to study harder.
ought
couldn't
We ______ (invite) so many people to our party! I'm worried that we won't have enough room for everyone.
(past negative advice / regret)
shouldn't have invited
They _____ (be) kinder to me. They were absolutely lovely. (past negative possibility)
couldn't have been