-었-

V/Adj/이다,아니다 + -었- This indicates that the tense is the past.

작년 여름에 고향에 갔어요.

I went to my hometown last summer.

어제 날씨가 정말 추웠어요.

The weather was really cold yesterday.

저는 회사원이었어요.

I was a company employee.

여기에 고양이가 있었어요.

There was a cat here.