Ex1: (-),(?),(+)
a, She sometimes has classes in the afternoon
b, He doesn't usually come home until 10p.m
c, They aren't often at home in the evening
d, The salegirls are usually very young
e, He can often go home late
f, Nam is never late for school
g, She's often in a badminton competition
h, Lien usually goes to the movies on Sungday afternoon
i, Mr and Mrs Hung always go camping once a week
Giúp mình nhanh nhé!