YOU SAID:

Fishes are swimming, the sky is darkening

INTO JAPANESE

魚が泳いでいる、空が暗くなってる

BACK INTO ENGLISH

The fish are swimming, the sky is dark

INTO JAPANESE

魚が泳いでいる、空は暗い

BACK INTO ENGLISH

The fish are swimming, the sky is dark.

INTO JAPANESE

魚が泳いでいる、空は暗い。

BACK INTO ENGLISH

The fish are swimming, the sky is dark.