1. (+) Liz talked to Ba about her vacation.
(-) Liz didn’t talk to Ba about her vacation.
(?) Did Liz talk to Ba about her vacation?
2.(+)Mrs. Robinson bought a poster.
(-)Mrs.Robinson didn’t buy a poster.
(?)Did Mrs.Robinson buy a poster?
3.(+)I played volleyball last week.
(-)I didn’t play volleyball last week.
(?)Did I play volleyball last week?
4.(+)Hoa thought sewing was a useful hobby.
(-)Hoa didn’t think sewing was a useful.
(?)Did Hoa think sewing was a useful?
