Question

must mustn't gaveto don't have como usar

Answer 1

Nós usamos "should" / "shouldn't" + infinitivo do verbo principal (sem "to") 

Exemplo 

I 
You 
He, She, It 
We 
Theyshoulddomore exercise.geta new car.shouldn't
(should not)smoke.spendso much money.
ShouldI 
you 
he / she / it 
we 
theygetmore qualifications?wearsomething different?

Should have

Nós usamos "should have" para dar, ou pedir uma opinião no presente sobre algo que aconteceu no passado:"I had a terrible stomachache." "You should have gone to the doctor’s.""I didn’t hear from my father last week." "You should have calledhim.""She isn't happy with the salary she’s getting." "She shouldn't have accepted the job."

Formulário

Nós usamos "should" / "shouldn't have" + o particípio passado do verbo principal 

Exemplo 

I 
You 
He / She / It 
We 
Theyshould havetakena taxi.shouldn't havewrittenthat comment.
ShouldI 
you 
he / she / it 
we 
theyhave workedovertime?