YOU SAID:
james is sad because he liked the kitten
INTO JAPANESE
ジェームズは子猫が好きだったので悲しい
BACK INTO ENGLISH
James was sad because he liked kittens
INTO JAPANESE
ジェームズは子猫が好きだったので悲しかった
BACK INTO ENGLISH
James was sad because he liked kittens
Well done, yes, well done!