YOU SAID:
when pigs fly you will die
INTO JAPANESE
豚が飛ぶとあなたは死ぬ
BACK INTO ENGLISH
You die when the pig flies
INTO JAPANESE
豚が飛ぶと死ぬ
BACK INTO ENGLISH
Pig dies when it flies
INTO JAPANESE
飛ぶと豚は死ぬ
BACK INTO ENGLISH
Pigs die when they fly
INTO JAPANESE
豚は飛ぶと死ぬ
BACK INTO ENGLISH
Pigs die when they fly
That didn't even make that much sense in English.