English Grammar: Past Simple vs. Past Continuous, Used to, Modals, Reported Speech

When past simple and while past continuous. Used to: affirmative - S+used to+v.ing, negative - S+didn't use to+inf, interrogative - Did+S+use to+inf? Yes, I did. No, I didn't. Active Voice: Subject+verb+D.C.+Complement

Passive Voice: Subject+verb+D.C. (by)+Complement

Modals

• can/can't -> puede/no puede
• could/couldn't -> podía/no podía
• should/shouldn't -> debería/no debería -> consejo
• must -> deber -> obligación
• mustn't -> no deber -> prohibición
• have to -> tener que
• don't have to -> no tener que -> no obligación
• may -> puedo que
• might -> podía ser que -> posibilidad

Reported Speech

• now -> then
• today -> that day
• tomorrow -> the next day/the following day
• yesterday -> the previous day/the day before
• next week -> the following week
• a week ago -> the week before
• this -> that
• these -> those
• here -> there