If we see someone breaking the rules of etiquette,we may give them some suggestions politely.
条件壮语从句 If we see someone breaking the rules of etiquette
主语 we 谓语 see 直接宾语 someone 间接宾语 breaking the rules of etiquette
同理可析someone cuts in front of you in line,you could ask them,Sorry,would you mind joiningthe line?If someone is smoking on the bus,we could ask,Excuse me,could you please put out thatcigarette?