a The plane leaves in half an hour but Nick isn't at the airport yet.
b My best friend loves sciene fiction films but they don't interest me.
c I don't study chemistry because it is difficult.
d I don't dance because I look stupid.
e The Sun doesn't go round the Earth, the Earth goes round the Sun!
f My new computer does lots more things than my old one, and it doesn't crash.
g My dad doesn't have any qualiffications but he has a really good job.
h Fire needs oxygen to burn. It doesn't burn without oxygen.
i My teacher doesn't own a mobile phone because some people think they are bad for your health.
j According to scientists, animals live longer if they don't eat too much.