you shouldn't do before you go to bed, you have to do after your lessons today, you don't have to do when you're on holiday, you shouldn't do the night before an exam, you don't have to do if you shop online, you mustn't do when you're driving, which you had to do as a child and which you found difficult, you should consider if you go on a date, you must do if you are invited to a wedding, you must do to improve your English, you should do to avoid getting ill, you must do before you go on a long journey by car, you shouldn't do at a job interview, you don't have to do if you shop online, you won't have to do after you finish your studies.

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