You must be polite to the elder.(改为祈使句）

You must be polite to the elder.(改为祈使句） You must be polite to the elder.改为祈使句 You shouid be polite to the old 改为祈使句 You should be polite to the old.改为祈使句 （Be polite to the old You should be polite(改为祈使句) You must be friendly to the animals in the zoo.改为祈使句. you must be friendly to the animals in the zoo.改为祈使句视 You must be king to other people.怎样改为祈使句 You must be careful when crossing the street.改为祈使句 You must be careful when you cross the road.(改为祈使句） we should be polite to the elderly at any time.怎样改为祈使句 You must listen to the teache carefully.改为祈使句