MODALS
When reporting speech, the tense usually changes. This is because when we use reported speech, we are usually talking about a time in the past (because.
Modals referring to the PAST could / should / shouldn`t / needn`t HAVE + past participle was (were able) / to had to + infinitive.
The Passive Voice. (A.) The teacher returned the exams on Monday. (B.) The exams were returned on Monday. The two sentences have basically the same meaning,
