They don’t work on Saturdays and Sundays.为什么用don’t来否定

They don’t work on Saturdays and Sundays.为什么用don’t来否定 They don't work on Saturdays and Sundays.为什么否定句用and? On Saturdays and Sundays,we don't go to work.(同义句) they don't like to s___ at home on saturdays and sundays.the 嘻嘻…… Mr and Mrs Black__(don't aren't)work on Sundays. Saturdays and Sundays are w___,most people don't w___on Satu Do they work _____ Saturdays and Sundays? Most people work on the weekend,don't they.做否定回答? She don't do homework on Sundays my aunt don't work on sundays,这句话中的work要加S吗? 选择,They,don,t,stay,shooI,SaturdaYs,A,at,on,B,in,at,C,for,in don't work on it