Hello Teachers, <br/><br/>I have to join two sentences using the word "except'. <br/><br/>1.Everybody knew the news. <br/><br/>2.John did not know the news. <br/><br/>Now these two can be joined as <br/><br/>3.Everybody, except John, knew the news. <br/><br/>4.Everybody knew the news except John. <br/><br/>Is there any rule for this. Is comma in (1) is mandatory? <br/><br/>Thanks.