Means "please don't". It is a polite request. Removing the ください makes it more casual.
Formed by a verb in the negative form (ない) with the で particle.
> [!info] Example
> {冷蔵庫|れいぞうこ}のデザートは食べ==ないでください==。
> Please do not eat the dessert from the fridge.
## なさい
This form is used when commanding an action.
It is used with verbs by removing the ます and adding なさい. In casual conversation, it can be shortened to な.
> [!info] Example
> {質問|しつ|もん}を{答|こた}え==なさい==。
> Answer the question.
## ように言う
It means "to tell", "to request", "to order".
It is form by added ように{言|い}う to a verb. The verb {頼|たの}む can be used for requests, while {命|めい}じる can be used for order. The verb {言|い}う can tell the three meanings depending on the tone.