Hello, my friends! I was wondering whether the sentence below is correct: By doing so ,the peace of this society is maintained. The problem is the "subject." Some of my friends think that the sentence might be wrong, for they think the Logical Subject of "following" should be "they" or "he" and so on (that is, "By doing so, they can maintain the peace of this society")". They think that it is Ungrammatical. Yet some think that it is acceptable in spoken English. What is your opinion?