YOU SAID:
when pigs fly i will never watch harry potter again
INTO JAPANESE
豚が飛ぶとき、私は再びハリー・ポッターを見ない
BACK INTO ENGLISH
When pigs fly, I will not see Harry Potter again
INTO JAPANESE
豚が飛ぶとき、私はハリー・ポッターをもう一度見ないだろう
BACK INTO ENGLISH
When pigs fly, I will not see Harry Potter again
That didn't even make that much sense in English.