PASSO 1Scegli l'opzione corretta
PASSO 2Aggiungi gli esercizi che ti piacciono ai Preferiti
Use the past tense after the phrase as if or as though. He talks as if he knew everything, means He talks as he would talk if he knew everything.
Use the subjective were with the verb to be after as if: He acts as if he were a rich man.
After the verbs can, must, may, shall, and will, use the infinitive without to , and not the third person of the present.
The verb after a since clause of time is generally in the present perfect tense.
Don't use must and ought to as past tenses. To express a past duty (which wasn't done) use the perfect infinitive without to after ought to or should, or expressions such as had to, was obliged to.
In indirect speech use must and ought to as past tenses: He said he must do it.