be + ing was ~ing were ~ing I was going. 나는 가고 있었어.
We were going. 우리는 가고 있었어.
I was having dinner. 나 저녁 먹고 있었는데.
I was talking to him. 나 걔량 얘기하고 있었는데.
He was talking on the phone. 걔 전화 중이었어.
He was taking a shower. 걔 샤워 중이었어.
They were taking a class. 걔네 수업 중이었어.
They were dozing off. 걔네 졸고 있었어.
시제 훈련 study I was studying. 나 공부하고 있었어.
I studied. 나 공부했어.
I study. 나 공부해.
(언제나/늘) I will .....
원문 링크 : 과거진행시제