Changes in Reported Speech in English

When using Reported Speech one should remember to introduce some other changes apart from tenses. Not always are such changes necessary.

from into
time: now immediately / then
two days ago two days before / earlier
today that day
tonight that night
yesterday the previous day / the day before
place here there
this place that place
these places those places
verbs come go
bring take
modal verbs can could
will would
may might
WE DO NOT CHANGE: would, could, might, ought to, needn't have, used to