Ví dụ:
- Do they eat breakfast ?
=>+ yes,they do
+no ,they don't
-Does they go to school on tuesday?
=>+ yes,they do
+no ,they don't
-Do you swim in the pool?
=>+ yes,i do
+no ,i don't
-Do you like this book?
=>+ yes,i do
+no ,i don't
-Do you have any pen?
=>
+ yes,i do
+no ,i don't