变一般疑问句做肯否回答变否定句
41.Sarah can clean the classroom.42.They are in the zoo.43.There are some flowers in the vase.44.This is my sister.45.We are sweeping the floor.46.We need some masks.47.They like making the puppet.58.Su Hai and Su Yang live in a new house.49.I put a book on my head.50.They sing “In the classroom ”together