YOU SAID:
I don’t even know how butterflies manage to fly
INTO JAPANESE
私は蝶がどうやって飛ぶことができるのかさえ知らない
BACK INTO ENGLISH
I don't even know how butterflies can fly
INTO JAPANESE
私は蝶が飛ぶことができる方法さえ知らない
BACK INTO ENGLISH
I don't even know how butterflies can fly
That didn't even make that much sense in English.