-나는 그가 다른 여자와 데이트하는 장면을 목격했다.

I witnessed scenes that he go out with another woman. →​ I caught sight of him dating another girl.

-나는 무릎을 꿇고 용서를 구했다.

I kneeled down and asked for fogiveness. →​​ I fell to my knees and begged forgiveness.

​=> Another way: Your sentence is okay and this is another way of saying it.

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-자동차 판매량이 5% 이상 줄어 들었다.

The sales of cars decreased more 5%.​  →​​ ​ Car sales dropped more than five percent.