Necessity, Lack of Necessity & Prohibition
Plants [must / don't have to / must not] have water or they will die.
must
Winter is coming. You [ought to / could / shouldn't] get a warmer coat soon.
ought to
Traffic is terrible this morning. We [must / could / maybe] be late.
could
[Let's / Why we don't / Why don't you] eat Chinese for dinner tonight?
Why don't you
I think we're lost. We (should, turn) _____ left instead of right at the last intersection.
should have turned
My room is a mess, but I [have got to / must not / don't have to] clean it tonight. I can do it tomorrow.
don't have to
Jane promised to keep my secret, so she [had better / shouldn't / ought to] tell her boyfriend about it!
shouldn't
Carla [could / used to / should] live in Yamanashi many years ago.
used to
A: The TV is so loud! Would you mind [to turning / turning / to turn] it down?
B: [Yes, of course. / No, of course not.]
A: turning
B: No, of course not.
Oh no! I can't find my passport. I (must, forget) ____ it at home!
must have forgotten
Correct the error: The final exam will be difficult. We better study hard!
We had better study hard. = We'd better study hard.
Ian looks so young without a beard. He [must not / couldn't / shouldn't] be 40 now!
couldn't
I'm thirsty, but the cat's asleep on my lap. Would you mind [getting / if I get / if getting] me a cup of water while you're up?
getting
Did you hear that Nick got a new job? He [might / couldn't / must] be happy.
must
A salesperson [has to / doesn't have to / must not] motivate people to buy their product.
has to
Correct the error: We're almost out of gas. We ought stop at a service station soon.
We ought to stop at a service station soon.
Correct the errors: The children suppose be in bed by 9 PM.
The children are supposed to be in bed by 9 PM.
Correct the errors: Would you mind if I borrowing your pencil for a moment?
Would you mind if I borrow your pencil for a moment?
B: I [must have studied / had to study / should have studied].
had to study
Correct the error: Park here. It's free. You must not pay anything.
You don't have to pay anything.
Correct the errors: You hadn't better to use ChatGPT on your essay!
You had better not use ChatGPT on your essay.
Correct the error: Megan can know how to dancing salsa.
Megan knows how to dance salsa.
Correct the errors:
A: This is wonderful music. Will we dance?
B: No, let's don't dance. I rather just sit here and talk.
A: This is wonderful music. Shall/Why don't we dance?
B: No, let's not dance. I would (I'd) rather just sit here and talk.
Ahmed got into another accident. He [couldn't have texted / was supposed to text / shouldn't have been texting] while driving.
shouldn't have been texting