Two things you have to do at work / at class.
Two things you should do and two things you shouldn't do when you have a job interview.
Two things you have to do if you want to live and work in an English-speaking country.
Two things you shouldn't do the night before an exam.
Three things you don't have to do when you're on holiday.
Three things a good student has to do to improve their English.
Two things you don't have to do if you shop online.
Two things a teacher has to do before a class.
Two things you should do if you've been invited for dinner.
Two things you must do before you catch a plane.
One thing you had to do when you were a child that you really disliked.
Two things you shouldn't talk about with strangers.
Two things you have to do after class today.
Two things you have to do in an airport.
Two things you should find out about a country before you visit it.
Two things you should think about before you buy a new phone.
Two things you shouldn't do if you have flu.
Two things you shouldn't do before you go to bed.
One thing you should do if you have a headache.
One things you must do and one thing you mustn't do when you're driving.