Ability and Possibility: -(으)ㄹ 줄 알다/모르다
In the previous post we talked about the verb ending -(으)ㄹ 수 있다/없다 as a way to tell others what you can or cannot do. There is another way how to do the exact same thing. That other way is another verb ending which is -(으)ㄹ 줄 알다/모르다. This has a very similar meaning as -(으)ㄹ 수 있다/없다, but is still different.
To Know How And To Not Know
Like the earlier one, the verb ending -(으)ㄹ 줄 알다 you use to tell someone what you can or cannot do. It is thus a way to express your abilities. This expression does this by telling the listener you know how to do something. This is a distinct difference and because of its difference it has a major constraint. Whereas -(으)ㄹ 수 있다 is not only used to express ability, but also possibility, the verb ending -(으)ㄹ 줄 알다 can only be used to express your capability to do something. It cannot express a possibility.
Like the earlier verb ending, -(으)ㄹ 줄 알다 has a distinct negative antonym which is -(으)ㄹ 줄 모르다. It thus simply tells the listener that you do not know how to do something; you lack the necessary skills to do so.
The How To
Using the forms -(으)ㄹ 줄 알다/모르다 with a verb is done the same way as the previous verb ending. First you will need the verb stem, which is quite easy. Then you simply have to slap the verb ending to it. When the verb ending ends in a vowel you will need to use -ㄹ 줄 알다/모르다. When the verb stem ends in a consonant (batchim), you will slap -을 줄 알다/모르다 at the end.
Of course, be aware of the Korean irregular, some irregular verbs tend to be quirky with this verb ending. Furthermore you will need to keep an eye out for the two verbs used in this grammar pattern as both, the positive and negative expression, are irregular. 알다 is a member of the ㄹ irregular verb group and 모르다 a member of the 르 irregular verb group.