将下列句子改为否定句和一般疑问句,并作肯定和否定回答. 1、People usually eat moon cakes at Mid-Autumn Festival. 2、His father has two offices. 3、She wants to be a singer. 4、Mike usually does his homework after school. 5、The students like helping the old man. 6、My cousin studies Maths very hard. 7、It means you shouldn't park cars here. 8、I jog to school every day.