YOU SAID:

the cat is blue and very heavy

INTO JAPANESE

猫は青くてとても重い

BACK INTO ENGLISH

Cats are blue and very heavy.

INTO JAPANESE

猫は青くて重い。

BACK INTO ENGLISH

Cats are blue and heavy.

INTO JAPANESE

猫は青くて重いです。

BACK INTO ENGLISH

Cats are blue and heavy.