YOU SAID:
dolphins play to fast need to run
INTO JAPANESE
イルカは速く走る必要があるために遊ぶ
BACK INTO ENGLISH
Dolphins play because they need to run fast
INTO JAPANESE
イルカが遊ぶのは速く走る必要があるからです
BACK INTO ENGLISH
Dolphins play because they need to run fast
Well done, yes, well done!