难个鸡毛，别用小学生水平来质疑英语。
"Let them burn"(1) is correct; "Let them burned" is wrong. Let is only followed by bare infinitive, never the past participle. While you can say "Let them be burned,"(2) it's not the same as "Let them burn." (1) means to allow them to catch fire, to undergo burning. (2) means to allow them to receive burning (as someone else's action)

burn可以作不及物動詞，let them burn這句話有什麽問題？反觀支那語裡面一大堆及物動詞的主動和被動居然完全是同一個意思，這件事情做了=這件事情被做了，這個食物可以吃=這個食物可以被吃，完全靠常識來猜句子的意思，真是匹配支那豚狡猾的個性。