Question

다람쥐가 호박을 먹고 있어요 -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

The squirrel is eating the pumpkin

Front	다람쥐가 호박을 먹고 있어요
Back	The squirrel is eating the pumpkin
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 다람쥐가 호박을 먹고 있어요 Squirrel Eating Pumpkin