This worksheet compares four connecting patterns: -고서 (after doing), -고 보다 (realizing after doing), -고 들다 (pushing hard or persistently) and -고 해서 (one reason among several).
By the end, you can tell the meanings of -고서, -고 보다, -고 들다 and -고 해서 apart, and you can use each one correctly in a sentence.
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