To ask someone to do something for you, first, pick the action (verb) you need them to do for you. Then:
Examples:
Sentence examples:
Please buy potatoes.
Please study hard.
Please read the book.
Exception 1: for verbs that end with the consonant ㄹ, like “팔다” (to sell), remove the ㄹ before adding 세요:
Please sell a lot!
많이 파세요 is a common way to say goodbye to a shop owner after you make a purchase.
Exception 2: for verbs that end with the consonant ㅂ, like “굽다” (to bake), remove the ㅂ, add 우, then 세요:
Please bake!
To ask someone to not do something, simply add “지 마세요” to the verb stem.
Don’t go.
Please don’t take photos.