Rewrite using: may, can't, mustn't, shouldn't, might not
He is a terrible singer.
He can't sing.
You must to turn on the microphone before you speak.
You must turn on the microphone before you speak.
A certainty about how someone feels.
You must be/feel...
I would have stayed later, but I was tired.
Me habría quedado hasta más tarde, pero estaba cansada.
He couldn't complete the film on time.
He wasn't able to complete the film on time.
In my opinion, he watches too much television.
He shouldn't watch so much television.
Could have you understood the film without subtitles?
Could you have understood the film without subtitles?
Advice to someone new at your school.
You should...
I must have misheard the singer's name.
He debido de oír mal el nombre del cantante.
They might go dancing later tonight.
They may go dancing later tonight.
Do you mind if I sit here?
May I sit here?
That girl looks familiar. She might has been here before.
That girl looks familiar. She might have been here before.
A possibility that something was true in the past.
They/it might have...
Their music might not appeal to you.
Puede que su música no te guste.
You should book tickets in advance.
You ought to book tickets in advance.
No one is allowed to smoke in the recording studio.
Sarah needn't wait in the queue last night.
Sarah needn't have waited in the queue last night.
Something you had the ability to do but didn't do.
I could have... but I didn't.
I should have seen the film on a big screen.
Debería haber visto la película en la gran pantalla.
We needn't be there until until 7.30.
We don't have to be there until 7.30
It's not certain that she will appear in the film.
She might not appear in the film.
He couldn't expect to win. He looked completely shocked.
He couldn't have expected to win. He looked completely shocked.
A regret about something in your past.
I should have...
We needn't have bought tickets in advance.
No necesitábamos haber comprado las entradas con antelación.
Everyone has to attend all rehearsals.
Everyone must attend all rehearsals.