not only .... but also, as well as
This expression is used when acknowledging the statement in the preceding clause but at the same time adding the statement in the following clause.
It is also used in the form 도 -거니와.
Note that when the preceding clause contains a positive statement, then the following clause must also be positive, and when the preceding clause contains a negative statement, then the following clause must also be negative.
Neither the imperative nor propositive forms can be used in the following clause.
Not only the first clause is true, but the second clause is also true.
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