IS NOT SITTING - THE TEACHER ............ ON THE FLOOR.
IS HAVING - MY MOTHER ...............BREAKFAST.
ARE HAVING - MY FRIENDS .......... DINNER.
ARE NOT WRITING - THEY .......... A TEXT.
IS WRITING - PATRÍCIA .......... A MESSAGE.
ARE TALKING - PEOPLE...... VERY LOUD.
IS TALKING - MY FRIEND ........ TO THE TEACHER.
AM DOING - I .......... MY HOMEWORK.
ARE STUDYING - RITA AND MARIA ......... FOR THE TEST.