6. Susan felt sick because she ate 4 cream cakes
=> If Susan hadn't eaten 4 dream cakes, she wouldn't have felt sick
7. He is fat because he eats so many chips
=> If he didn't eat so many chips, he wouldn't be fat
8. Lan didn't go to school yesterday because she was ill
=> If Lan hadn't been ill, she would have gone to school yesterday
9. She hadn't got a big house so she couldn't invite you to stay
=> If she had got a big house, she could have invited you to stay