1 has => have
2 should => shouldn't
3 have to has => have to have
4 to lower => lower
5 avoid => to avoid
VI
1 The car is too expensive for us to buy
2 We didn't arrive early enough to see the film
3 Unless you rest yourself, you will be ill
4 It is the first time Nam has spoken to a foreigner
5 How heavy is your suitcase





