YOU SAID:

told them they'd catch their death, and they did

INTO JAPANESE

彼らは彼らの死を捕まえるだろうと彼らに言いました、そして彼らはしました

BACK INTO ENGLISH

They told them they would catch their death, and they did

INTO JAPANESE

彼らは彼らに彼らの死を捕まえると彼らに言いました、そして彼らはしました

BACK INTO ENGLISH

They told them they would catch their death, and they did