Lesson 10
Saying “Let’s” and suggesting doing something together in 반말 is fairly simple. You can just add -자 at the end of the verb stem.
먹다 (to eat) → 먹자. (Let’s eat.)
가다 (to go) → 가자. (Let’s go.)
만나다 (to meet) → 만나자. (Let’s meet.)
Or if the sentence ends with -(으)실까요? in 존댓말, you can drop both the -시 suffix and the -요 at the end to form -(으)ㄹ까? sentences in 반말.
가실까요? → 갈까? (Shall we go?)