36 Units
Sample lessons:
unit1 booking airplane tickets
unit2 at the airport
unit3 entry
unit4 meeting somebody
unit5 at the hotel

16 Units
Sample lessons:
unit1 Taking a Taxi
unit2 At the Restaurant
unit3 Asking for Direction
unit4 Exchange Money
unit5 Taking a Bus

20 Units
Sample lessons:
unit1 on the plane
unit2 entry formalities
unit3 meeting somebody at the airport
unit4 taking a taxi
unit5 at the front desk of a hotel

20 Units
Sample lessons:
unit1 how do you do
unit2 how is your health
unit3 are you busy with your work
unit4 may I know your name
unit5 let me introduce