Direct to Indirect (Imperative Sentence)
An imperative sentence has a command, order, request or suggestion.
To convert an imperative sentence to indirect speech the verb (said/told) of reporting verb is replaced by some specific verbs like requested, ordered, advised, suggested, etc.
For example,
Rayna said to me, “Please help me to complete my homework.” (Direct speech)
Rayna requested me to help her with her homework. (Indirect speech)
Doctor said to him, “Drink plenty of water”. (Direct speech)
Doctor advised him to drink plenty of water. (Indirect speech)