Reported (indirect) speech reports what someone said without quoting them. With a past reporting verb, tenses usually move one step back and pronouns and time words change.
1Changes
am/is → was; are → were; will → would; can → could; has/have → had
Simple past → past perfect
today → that day; tomorrow → the next day; yesterday → the previous day; here → there; now → then
Questions: asked + if/whether (yes/no) or the question word, with statement word order
Commands and requests: told/ordered/requested + object + to-infinitive
Universal truths keep their present tense