... Ron stopped doing some things and started doing other things studying hard smoking He stopped going to bed early He started going out every evening running miles every morning Spending a lot of ... playing tennis tomorrow unless/providing it’s raining We’re going to start painting the house tomorrow unless/provided it’s not raining You can’t smoke in here unless/as long as you leave a window ... Put the verb into the correct form, -ing or infinitive (I am used to doing or I used to do) When I was a child, I used to swimming every day (go) It took me a long time to get used to ...