YOU SAID:

Dinosaurs went extinct at least twenty years ago.

INTO JAPANESE

恐竜は少なくとも20年前に絶滅した。

BACK INTO ENGLISH

The dinosaur was extinct at least 20 years ago.

INTO JAPANESE

その恐竜は少なくとも20年前には絶滅していた。

BACK INTO ENGLISH

The dinosaur was extinct at least 20 years ago.