4.I took the job because I didn't know how difficult it was.  If……………………………………………………………………….. 5. My father didn't earn much money, so life wasn't easy for us.  If……………………………………………………………………….. 6. I don't ride the bus to work every morning because it's always so crowded.  If……………………………………………………………………….. 7.The wind is blowing hard. so I won't take the boat out for a ride.  If……………………………………………………………………….. 8.Nick can't find the way because he hasn't got a map.  If……………………………………………………………………….. 9. I can't look the word up because I haven't got a dictionary.  If……………………………………………………………………….. 10.We don't visit our parents very often because they live so far away.  If……………………………………………………………………….. 11. You stop smoking, so you feel better. Unless…………………………………………………………………………… 12. I went to the party last night, so I am tired now.  Unless……………………………………………………………………. 13. Unless you leave immediately, I will call a policeman.  If……………………………………………………………………….. 14. He would be happy if he were here now.  Were ………………………………………………………………………… 15.I’d have gone swimming yesterday afternoon if I had had time. Had ………………………………………………………………………………. 16.I didn’t visit you because I didn’t know you were in hospital.  Had………………………………………………………………………. 17. The earth moves around the sun, so everything doesn’t float.  If………………………………………………………………………………….. 18. He didn’t take my advice, he isn’t a rich man now. If………………………………………………………………………………………. 19. 1 don't know anything about plumbing, so I can't fix the leak in the sink myself If………………………………………………………………………………………. 20. If Alan ate breakfast, he wouldn't overeat at lunch.  Unless………………………………………………………………………