Question

니콜은 쌍둥이를 임신하고 있었어요 -고 있- attaches to verb stems and marks an ongoing, continuous activity just as the '-ing' ending in English. This is the essential usage of -고 있-. However, the principle has other functions which are different from usages of '-ing'.

Accepted Answer

Nicole was carrying twins

Front	니콜은 쌍둥이를 임신하고 있었어요
Back	Nicole was carrying twins
Notes	-고 있- attaches to verb stems and marks an ongoing, continuous activity just as the '-ing' ending in English. This is the essential usage of -고 있-. However, the principle has other functions which are different from usages of '-ing'.

고 니콜은 쌍둥이를 임신하고 있었어요 Nicole Carrying Twins