As you may remember, the positive grammar pattern in the past is “V. S. +고 있었어요/go it eoc eo yo”. The negative form of grammar pattern in the past is “V.S. + 고 있지 않았다/go it ji an ac da.” Please read some example and then make your own sentences.

To go –가다

가고 있지 않았다 – 가고 있지 않았어요

집에 가고 있지 않았어요/I was not going home.

To eat – 먹다

먹고 있지 않았다 – 먹고 있지 않았어요

밥을 먹고 있지 않았어요/ I was not eating a meal.

To watch/to see 보다

보고 있지 않았다 – 보고 있지 않았어요

저는 영화를 보고 있지 않았어요/ I was watching a movie.

To meet- 만나다

만나고 있지 않았다 – 만나고 있지 않았어요

저는 친구를 만나고 있지 않았어요/I was not meeting a friend now.

To study – 공부하다

공부하고 있지 않았다 – 공부하고 있지 않았어요

저는 공부하고 있지 않았어요/I was not studying now.

Make your own sentences and let me know if you have any question. Please watch the video below to listen how to pronounce.