Verbseoul.
하다 verb (adj)

이상하다 conjugation (isanghada, to be strange, to be unusual)

To say to be strange, to be unusual politely in the present tense, use 이상해요 (ee-sahng-hae-yoh) · isanghaeyo. Below is the full conjugation of 이상하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb (adj)): 하다 adjectives use the same verb 하다 as a suffix to turn descriptive nouns into predicates (행복하다 = to be happy). They conjugate identically to 하다 verbs: the 하 contracts before -아/-어 suffixes to give 해. 행복해요, 행복했어요, 행복합니다. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
이상해
ee-sahng-hae
isanghae
이상해요
ee-sahng-hae-yoh
isanghaeyo
이상합니다
ee-sahng-hahm-nee-dah
isanghamnida
Past
이상했어
ee-sahng-hae-ssuh
isanghaesseo
이상했어요
ee-sahng-hae-ssuh-yoh
isanghaesseoyo
이상했습니다
ee-sahng-hae-sseum-nee-dah
isanghaesseumnida
Future
이상할 거야
ee-sahng-hahl guh-yah
isanghal geoya
이상할 거예요
ee-sahng-hahl guh-yae-yoh
isanghal geoyeyo
이상할 겁니다
ee-sahng-hahl guhm-nee-dah
isanghal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
이상하세요
ee-sahng-hah-sae-yoh
isanghaseyo
Suggestion / Let's Polite (요)
이상해요
ee-sahng-hae-yoh
isanghaeyo
Question Polite (요)
이상해요?
ee-sahng-hae-yoh-?
isanghaeyo?
Connective "and" — (고)
이상하고
ee-sahng-hah-goh
isanghago
Conditional "if" — (면)
이상하면
ee-sahng-hah-myuhn
isanghamyeon
Progressive (고 있어요)
이상하고 있어요
ee-sahng-hah-goh ee-ssuh-yoh
isanghago isseoyo
Want to (고 싶어요)
이상하고 싶어요
ee-sahng-hah-goh shee-puh-yoh
isanghago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
이상할 수 있어요
ee-sahng-hahl soo ee-ssuh-yoh
isanghal su isseoyo
Because / So (아/어서)
이상해서
ee-sahng-hae-suh
isanghaeseo
Noun form — (기)
이상하기
ee-sahng-hah-gee
isanghagi
Noun form — (음)
이상함
ee-sahng-hahm
isangham