עמוד:13

LANGUAGE 1 Present Simple and Present Progressive The article “ Let’s See ” on pages 9 and 10 uses the Present Simple to describe habits , facts and general truths . n The hero puts on night vision goggles and sees the bad guy . n The BrainPort includes a tiny video camera . We use time expressions like always , usually , often , sometimes , rarely and never in the Present Simple . The article uses the Present Progressive to talk about actions that : a . are taking place now . n Craig is testing the glasses . b . will happen in the near future . n Are you planning a visit to Philadelphia ? c . are happening in the present over a period of time . n Brainport is helping to improve the lives of blind people . We use time expressions like now , right now , at the moment and presently in the Present Progressive . Remember ! Stative verbs such as look , see , think , believe and seem are usually not used in the Present Progressive . n The buildings look real . GRAMMAR APPENDIX page 164 A 1 Complete the facts about vision below with the correct form of the verb in brackets . SENSATIONAL FACTS 1 You … ( get ) two different pictures , one from each eye . Your brain … ( put ) the two pictures together . 2 Your pupils … ( change ) size according to the amount of light . When there … ( be ) a lot of light , the pupils … ( open ) up wide to let as much light as possible into the eyes . 3 Most people … ( blink ) every 2-10 seconds , about 6 million times each year . Each time you … ( blink ) , you … ( shut ) your eyes for 0 . 3 seconds . This … ( mean ) your eyes … ( be ) closed at least 30 minutes a day just from blinking . 4 A newborn baby … ( see ) the world upside down because it … ( take ) some time for the baby's brain to learn to turn the picture right-side up . 5 People who … ( be ) color blind … ( have ) difficulty seeing colors , especially green and red . About 1 in 30 people … ( be ) color blind . 2 What tense did you use ? Why ? 3 Find one more interesting fact about the way people see . You may use the Internet . You may want to use keywords such as “ vision” , “ unusual ” and “ facts ” to help you find information .

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