How to say Don't do and Let's not do, in Korean?

Verb + 지 말다

Korean grammar construction -지 말다 is used to prohibit an action. -지 말다 is often used with imperative mood. See this and this lessons to learn more about imperative mood.

See examples,
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책을 보지 마십시오.

Korean

책

보다

English

book

to see, to read

Please don't read the book.

책을 보지 마+십시오.

떠들지 마세요.

Korean

떠들다

English

to make noise

Please don't make noise.

떠들지 마+세요.

수업 시간에 먹지 말자.

Korean

수업

시간

먹다

English

class, lesson

time

to eat

Let's not eat during the classes.

수업 시간에 먹지 말+자.

앞으로 늦지 맙시다.

Korean

앞으로

늦다

English

in front of, from now on, in future

be late

Please don't be late in future.

앞으로 늦지 마+ㅂ시다.

제가 문을 닫지 말까요?

Korean

저

문

닫다

English

I

door

to close

Shall I not close the door?

저+가 문을 닫지 마+ㄹ까요?

걱정하지 말고 쉬세요.

Korean

걱정하다

쉬다

English

to worry

to have a rest

Don't worry and have some rest.

걱정하지 말+고 쉬세요.

Quick reference (click to open)

Vowels: a, e, i, o, u

Consonants: b, c, d, f, g, h, j

Syllable: Bra-zil (2 syllables), Ar-gen-ti-na (4), In-di-a (3), Viet-nam (2), thin-king (2), beau-ti-ful (3), good (1)

Batchim: is a final consonant in a syllable. → Bra-zil (batchim: 'l'), Ar-gen-ti-na (batchims: 'r' and 'n'), In-di-a ('n'), Viet-nam ('t', 'm')

Romanization: is a conversion of text (not pronunciation ! ) from different writing system (Korean, Arabic, Russian, etc.) to the Roman (Latin) alphabet.

IPA: is an alphabetic system of phonetic (pronunciation) notation.

Noun: road, user, sister, table, sky

Pronoun: I, my, we, you, they, her

Verb: to go, to study, to think, to feel

Adjective: cold, kind, hungry, curious, expensive

Adverb: quickly, nicely, never, exactly, urgently

Preposition: from, to, on, in, with, till

Conjuction: and, because, if, but, while

Declarative sentence: I learn Korean.

Interrogative sentence: Do you learn Korean?

Imperative sentence: You must learn Korean!

Exclamative sentence: Wow, you learn Korean!

Verb / Adj. stem in Korean: part of a verb or adj. which is left after removing the last syllable -다 ( e.g. 가다 → 가, 예쁘다 → 예쁘, 듣다 → 듣 ).