Usages of ~ttae
계단을 올라갈 때 조심해요.gyedaneul ollagal ttae josimhaeyo.
Be careful when going up the stairs.
친구를 만날 때 사진을 찍어요.chingureul mannal ttae sajineul jjigeoyo.
I take pictures when I meet a friend.
대회에 참가할 때 필수 서류를 제출해야 해요.daehoee chamgahal ttae pilsu seoryureul jechulhaeya haeyo.
You must submit the required documents when you participate in the competition.
옷이 구겨졌을 때 다리미로 다림질해요.osi gugyeojyeosseul ttae darimiro darimjilhaeyo.
When clothes are wrinkled, iron them with an iron.
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