When do we use the preterite tense?
options:

to tell someone what to do

to talk about completed actions in the past

to talk about what is happening right now

to talk about the future

Preterite is used to talk about completed actions in the past.

Mandame la pregunta por favor

I'm not sure if you mean for us to translate or to answer. but i'll translate as these are questions for you to answer. 1. how long has it been since you've read a book? . 2. how long has it been since you've eaten breakfast? . 3. how long has it been since you've talked with your spanish professor?