Say how you will change the following in the reported speech if uo speak about past events. tomottow > ? this > ? in 3 days > ? these > ? in 4 mountains > ? now > ? in a year > ? yesterday > ? next day > ? 3 years ago > ?

tomorrow - the next day - завтра - на другой день
this - that - это - то
in 3 days -  three days after that - через 3 дня - три дня спустя
these - those - эти - те
in 4 months - four months after that - через 4 месяца - 4 месяца спустя
now - at that time - сейчас - в то время
in a year - after one year- через год - год спустя
yesterday - the day before yesterday - вчера - задень до вчерашнего
next day - the day after that - на следующий день - день спустя
3 years ago - three years before that - 3 года назад - 3 года до того как

Я понимаю, что вы хотите. Думаю будет как-то так.

tomorrow - the next day
this - that
in 3 days -  three days after that
these - those
in 4 months - four months after that
now - at that time
in a year - after one year
yesterday - the day before that
next day - the day after that
3 years ago - three years before that