Ai giúp mình với ạ He was punished because of his behaviour = Had he ........................

`->` Chuyển sang câu điều kiện loại `3` : If + S + had + P2, S + would/could + have + P2 

`=>` If he hadn't behaved badly, he wouldn't have been punished

`->` Cấu trúc đảo ngữ câu đk loại `3` : Had + S + ( not ) + P2 , S + would/could have + P2.

`=>` Đáp án : Had he not behaved badly, he wouldn't have been punished.