saega beollereul bwayo. beolleneun saereul mos bwayo.

새가 벌레를 봐요. 벌레는 새를 못 봐요.saega beollereul bwayo. beolleneun saereul mos bwayo.
The bird sees the worm. The worm can't see the bird.
Sae-ga peolle-reul pwayo. Peolle-neun sae-reul mot pwayo.

Sae-ga I used the Subject marker here. It is a simple statement. The bird sees the worm. I might have equally used the topic marker 'Sae-neun' but I am not obliged. However for the second sentence about the worm, I am changing topics. We are no longer speaking of what birds see. I need to mark the worm as my new topic! peolle-neun.

Note

Sae-ga peolle-reul pwayo. Peolle-neun sae-reul mot pwayo.

Sae-ga I used the Subject marker here. It is a simple statement. The bird sees the worm. I might have equally used the topic marker 'Sae-neun' but I am not obliged. However for the second sentence about the worm, I am changing topics. We are no longer speaking of what birds see. I need to mark the worm as my new topic! peolle-neun.

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