你最好不要不经过他允许就拿走他的钱包

我刚才回答了，但是你没有选择，你投票备选的没有带ask for 和without，你看看我上次的回答是不是
you'd better not take his bag without asking for his permission

You'd better not to take his wallet without asking for his permission.

You'd better not take his wallet away without asking for his permission.

You are supposed not to take off his wallet without asking for his permission

You'd better not to take his wallet without asking for his permission

你最好不要不经过他允许就拿走他的钱包
you'd better not take his wallet without his permission