（talk when food is in your mouth）改为否定祈使句

It is a bad ____ to talk with your mouth full of food 1.You'd better ____ when you have some food in your mouth. She is buying some food in the supermarket.（改为否定句） Talk loudly in the classroom.（改为否定句） 英语翻译it's ( )( )( )( )( )( )( ) with food in your mouth denny,touch your mouth.(改为否定句,但意思不变) you must wait for your turn when the light is red .改为祈使句怎么改? I hate it when they talk with their mouth full of food Can you open your mouth and show me your tongue?改为祈使句 Tom is looking out of the window in class.改为否定祈使句! 英语语法之定语It's bad manners to talk with your mouth full of food You mustn't talk loudly in the reading-room(改为祈使句）