* Lan bought a new dress 5 day ago
-> Lan didn't buy a new dress 5 day ago
-> Did Lan buy a new dress 5 day ago
* He eats fish everyday
-> He doesn't eat fish everyday
-> Does he eat fish everyday
* Lan has learned english for 2 years
-> Lan hasn't learned English for 2 years
-> Has Lan learned English for 2 years
* He sometimes comes to see his parents
-> He sometimes doesn't come to see his parents
-> Does he sometimes come to see his parents