Ram says,โIt will rain tomorrow.โ
Reported speech always takes a step back in time from direct speech.ย Present and future become past, past becomes past perfect. So the correct basic reported speech version of your sentence is:
ย
- Ram said that it would rain tomorrow.
ย
But, this would only be correct if the speech was reported on the same dayย on which it was actually said. For example, Ram says on Wednesday โIt will rain tomorrowโ. Then, you tell Sarah on the same day, what Ram said. It becomes: Ram said that it would rain tomorrow. If you told Sarah on a different day, say Thursday, then it would be different. Then you would say:
ย
- Ram said that it would rain the next day.ย orย
- Ram said that it would rain the following day.
ย
As a quick reminder, in reported speech:
Willย becomesย would.
Saysย becomesย said.
Tomorrowย becomesย the following day/the next day.