Verbseoul.
하다 verb
등산하다deungsanhadato climb mountains, to hike

To say to climb mountains, to hike politely in the present tense, use 등산해요 (deung-sahn-hae-yoh). Below is the full conjugation of 등산하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
등산해
deung-sahn-hae
등산해요
deung-sahn-hae-yoh
등산합니다
deung-sahn-hahm-nee-dah
Past
등산했어
deung-sahn-hae-ssuh
등산했어요
deung-sahn-hae-ssuh-yoh
등산했습니다
deung-sahn-hae-sseum-nee-dah
Future
등산할 거야
deung-sahn-hahl- -guh-yah
등산할 거예요
deung-sahn-hahl- -guh-yae-yoh
등산할 겁니다
deung-sahn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
등산하세요
deung-sahn-hah-sae-yoh
Suggestion / Let's Polite (요)
등산해요
deung-sahn-hae-yoh
Question Polite (요)
등산해요?
deung-sahn-hae-yoh-?
Connective “and” — (고)
등산하고
deung-sahn-hah-goh
Conditional “if” — (면)
등산하면
deung-sahn-hah-myuhn
Noun form — (기)
등산함
deung-sahn-hahm