The Word for please in Japanese changes according to context.
- onegai shimasu is formal and polite and suggests the speaker is asking a favour
- nanitozo is extremely polite and rarely heard
- douzo means something like "please go ahead and do X" and is often used in the phrase "this way please" (kochira e douzo)
- choudai means something like "please do X for me," and is considered fairly casual in Tokyo dialect. Choudai itashimasu means the same as itadakimasu.
- Kudasai means "please," "please do X for me," or "please give me X"
Please = kudasai
Please do it = (Word goes here) +kudasaimasu
Please don't do it = (Word goes here) +kudasaimasen
example
Please eat the meal = gohan o tabete kudasaimasu
お願い (onegai) means "favor" and 下さい (kudasai) is a way of saying "please". Their pronunciations are syllabic, onegai = "oh-nay-guy" and kudasai = "koo-duh-sai" (were ai has i as in "ire" sound).
onegaishimasu