Exercícios de gramática › Modal Verbs "have to/must/should"

Must, have to e should: frases afirmativas

480 exercícios de lacuna, 48 testes de dez

Must e should não levam -s nem to. Have to vira has to e se comporta como verbo comum.

De onde vem a obrigação

O teste clássico é quem a impõe:

• I must call my mother. — eu decidi; ninguém está me obrigando.
• I have to renew my passport. — as regras exigem.

Os dois estão certos na maioria das frases, e os americanos usam have to em quase todas. Onde a diferença aparece com clareza é em placas e regulamentos, que levam must: Passengers must show a ticket.

should para conselho

Should não obriga ninguém. Dá uma opinião sobre o melhor caminho:

You should take the earlier flight.

Existem versões mais fortes — ought to quer dizer o mesmo e é um pouco mais formal; had better carrega um aviso: You had better leave now dá a entender que algo ruim acontece se você não for.

have got to

No inglês britânico falado, have got to substitui have to:

I*’ve got to** go.*

Não tem forma de passado, então had to cobre o passado dos dois.

should have

Para dizer qual teria sido a melhor escolha no passado:

You should have told me. — você não disse, e isso foi um erro.

O português diz igual: «você deveria ter me contado».

Todas as formas

Exemplos

Tirados das 480 frases deste exercício. A resposta está destacada.

• The system logs every arrival, so employees have to be at work on time.
• Even where nobody is watching, people should follow traffic rules for their safety.
• I am telling you plainly: you must keep this secret!
• The law is plain: he has to be responsible for his own actions.
• The office closes at six sharp, so employees have to complete their daily tasks before leaving.
• Nobody is forcing us, but we should try our best to achieve our goals.
• The school charter binds us: we must be respectful to our teachers.
• His position obliges him, so he has to be careful with his words.
• A patrol checks it at every junction, so you have to wear a seatbelt while driving.
• Nobody is forcing you, but you should eat a balanced diet for good health.
• The traffic here is deadly: he must be careful while crossing the road.
• The company fines latecomers, so he has to arrive on time for the meeting.

Erros a evitar

Escolhas rápidas desta forma

Outras formas de Modal Verbs "have to/must/should"