$\text{I.}$
1.They have lived here for ten years.
2.They have checked the machines for two hours.
3.Nam has learnt English since 1998.
4.Nam has played computer game since 2002.
5.Ha hasn't gone aboard before.
6.She has driven for 1 month.
7.We have eaten since it started to rain.
8.I haven't had such a delicious meal before.
9.I haven't had my hair cut since I left her.
$\text{VIII.}$
1.Lan has studied English for five years and she still studies it.
2.Although the sun was shining, it wasn't very warm.
3.Nam used to live with his parents.
4.You shouldn't/ had better not/ ought not to talk with food in your mouth.
5.I prefer traditional dances to modern ones.