-자

V + 자 This indicates that the sentence is propositive and informal.

다같이 당구 치자.

Let's play pool.

가위바위보 하자.

Let's play rock-paper-scissors.

태형아, 잘 하자!

Taehyng, let’s do better! (or, Do better!)

→ Depending on the context, it may also be understood as an imperative sentence.

• Do not~ : ~지 말자

당구 치지 말자.

Let's not play pool.

낙서하지 말자.

Let's not scribble/graffiti.

• Since it is a propositive sentence, it cannot express tense.