Verbseoul.
하다 verb
긴장하다ginjanghadato be/become nervous, tense, strained

To say to be/become nervous, tense, strained politely in the present tense, use 긴장해요 (geen-chahng-hae-yoh). Below is the full conjugation of 긴장하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
긴장해
geen-chahng-hae
긴장해요
geen-chahng-hae-yoh
긴장합니다
geen-chahng-hahm-nee-dah
Past
긴장했어
geen-chahng-hae-ssuh
긴장했어요
geen-chahng-hae-ssuh-yoh
긴장했습니다
geen-chahng-hae-sseum-nee-dah
Future
긴장할 거야
geen-chahng-hahl- -guh-yah
긴장할 거예요
geen-chahng-hahl- -guh-yae-yoh
긴장할 겁니다
geen-chahng-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
긴장하세요
geen-chahng-hah-sae-yoh
Suggestion / Let's Polite (요)
긴장해요
geen-chahng-hae-yoh
Question Polite (요)
긴장해요?
geen-chahng-hae-yoh-?
Connective “and” — (고)
긴장하고
geen-chahng-hah-goh
Conditional “if” — (면)
긴장하면
geen-chahng-hah-myuhn
Noun form — (기)
긴장함
geen-chahng-hahm