4 1 Look at the examples from the text on page 44. Write (C) certain or (NC) not certain. Then complete the rules. a There will be some kind of base on the Moon C b We may even create lunar cities Ć NASA and the European Space Agency will probably send more astronauts to the Moon d We definitely won't live on the Moon all the time e We will certainly return to the Moon one day f Such trips might not interest as many people as those of the 1960s and 1970s . 3 We use and ? to show we are sure about the future. We use to show we are not sure about the future. We use probably, definitely and certainly to show how sure we are.