it hurts -- itai (adj.) desu
Ah, I'm tired. I'm exhausted. -- Aa, tsukareta.
to be sleepy -- nemui desu
Please repeat it slower. -- Mou ichido yukuuri onegai shimasu.
Please speak slowly. -- Yukkuri hanashite kudasai.
The menue, please.-- Menyu onegai shimasu. NOTE: onegai shimasu does not need a vern here; it is understood from the context.