Modal_Verbs

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can could may might will would shall should ought to must
You should exercise more.
I must see a doctor.
May I eat this apple?
This can’t be healthy!
modal verbs
Características dos modal verbs
São verbos auxiliares, portanto a negação é feita com verb + not, e a forma interrogativa é feita com o verbo antes do sujeito:
You shouldn’t overeat.
May I speak to you in private?
Com exceção de ought to, nunca são precedidos ou seguidos de to:
We must to visit Rod.
Wrong
Usos dos modal verbs
Dedução – Must expressa certeza que sim.
He must have the flu. He has all the typical symptons.
Possibilidade
“...I may be suffering from an eating disorder...”
A cure for cancer might never be discovered.
You could be developing bulimia.
Impossibilidade – can’t expressa certeza que não.
Brad can’t be sick. I spoke to him ten minutes ago.
Conselho – should e ought to são as formas mais comuns.
You should get professional help.
You ought to take some vitamin C to prevent influenza.
Permissão – can, could ou may podem ser usados.
You can open the window if you like.
May I take some of your painkiller?
Could we have your book for a few days?
You may now kiss the bride.
Mais informal
Mais formais
Pedidos / Solicitações – can, could, will e would podem ser usados.
Could you buy me some medicine?
Can you change this light bulb for me?
Will you please reserve a table in the non-smoking area for us?
Desejos mais formais - may
May the Lord protect you.
May you always have good health.
Habilidades / capacidades – can e could
He can lift very heavy weights at the gym.
He could run for miles when he was younger.