1.she/buy/a lot of souvenirs/lest summer vacation
(+)She bought a lot of souvenirs last summer vacation
(_)She didn't buy a lot of souvenirs last summer vacation
2.Nga/be late for school/yesterday morning
(_)Nga was late for school yesterday morning
(?)Was Nga late for school yesterday morning?
3.I/speak to her about my vacation
(+)I spoke to her about my vacation
(_)I didn't speak to her about my vacation
4.the chidlren/be hoppy in their trip to Nha Trang
(+)The children were happy in their trip to Nha Trang
(_)The children weren't happy in their trip to Nha Trang
1.she/buy/a lot of souvenirs/lest summer vacation
(+)She bought a lot of souvenirs last summer vacation
(_)She didn't buy a lot of souvenirs last summer vacation
2.Nga/be late for school/yesterday morning
(_)Nga was late for school yesterday morning
(?)Was Nga late for school yesterday morning?
3.I/speak to her about my vacation
(+)I spoke to her about my vacation
(_)I didn't speak to her about my vacation
4.the chidlren/be hoppy in their trip to Nha Trang
(+)The children were happy in their trip to Nha Trang
(_)The children weren't happy in their trip to Nha Trang