를 생각하면

when thinking of

→ 를
phrase Uncommon #6,973
when thinking of 를 marks the object of 생각하다, “to think of.” The subject is usually understood from context.
KO: 너를 생각하면 행복해요.
EN: When I think of you, I feel happy.

내가 그 에게 팔 아귀 수를 생각하면 말 이다.

When I think about the number of arms I could sell him.