'' will it rain tomorrow?''the boy said

`->` The boy asked if it would rain the following day.

`will->`$would$

$tomorrow$`->`$the$ $following$ $day$

`-` Câu tường thuật (Yes/No) 

S + asked + O + if/whether + S + V

`-` Câu tường thuật (Wh-questions)

S + asked + O + Wh  + S + V

`-` Reported speech đều lùi thì