Formal Propositive Ending

Propositive? It means you're proposing something. Marriage? Could be. If your Korean gets good enough you may propose to a Korean. I've seen it happen multiple times.

Anyway, we'll use the ㅂ시다 ending. You can propose a lot of things: "Let's go to the store", "Let's dance", "Let's go fishing". Here are some examples (the vowel-consonant rules apply):

같이 영화를 봅시다.
Let's see a movie together.
(together movie see-let's)

식사 합시다.
Let's eat.
(meal do-let's)

열심히 공부합시다!
Let's study hard!
(diligently study-let's)

Let's get married!