a- How often do Nga and Lan go camping?
- They sometimes go camping.
b. - How often do they go to the zoo?
- They usually go to the zoo.
c. - How often do they go walking?
- They always go walking.
d.How often do they play football?
- They never play football.
e. - How often do they go on a picnic?
- They usually go on a picnic.