-ing
This pattern expresses the progression or continuation of an action and is the equivalent of '-ing' in English. It is formed by adding 고 있다 to the stems of verbs. To express the continuation of an action that occurred sometime in the past, -고 있었다 is used.
To express that an action simply occurred in the past, the simple past form -았/었어요 is used.
Expresses that an action is ongoing. This pattern is sometime mentioned as progressive tense.
There is an honorific form of 고 있다 which is 고 계시다
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