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课件网) Grammar in Use Sound Body, Sound Mind Unit 3 Learning aims 能正确使用need to do / don’t need to do / needn’t do 能正确使用否定前缀non-, dis-, un-, mis-, in- and im- Lead in What is it about Activity 1 Know how to use prefixes non-, dis-, un-, mis-, in- and im- Look at the pictures and read the sentences. Pay attention to the words in bold. He became a non-smoker in order to keep healthy. Sea food may seem to disagree with some people. Look at the pictures and read the sentences. Pay attention to the words in bold. Hamburgers may taste delicious, but it is unhealthy to eat too many of them. It is incorrect to do sports with an empty stomach. nonsmoker disagree unhealthy incorrect non dis un in smoker agree healthy correct What word can you find in these words We put “non-, dis-, un-, in-” in front of the words, these are called “prefix”. Let’s learn nonsmoker disagree unhealthy incorrect The prefixes usually express the opposite meanings of the original words. impossible misplace Let’s see more examples. impossible misplace nonsmoker disagree unhealthy incorrect nonstop nonsense dislike discover disappear unhappy unlucky uncomfortable inexpensive informal impatient impolite misfortune misunderstand Exercise Fill in the blanks with the correct form of the given words. 1. It is _____ to keep healthy without good living habits. 2. Don’t eat too much junk food, or you will feel _____. 3. She _____ ice cream because it’s bad for her teeth. 4. My sister’s room is tidy, and she never _____ her things. 5. We felt very tired after a long and _____ walk. impossible uncomfortable dislikes misplaces nonstop dislike uncomfortable impossible nonstop misplace Read the text and fill in the blanks with the words in the box. impatient nonsense uncomfortable improper A(n) _____ habit does a lot of harm to people. For example, staying up late is very bad for people’s health. Clearly, they will feel sleepy and _____ the next day. What’s worse, people will become _____ and they may even forget important dates. Sometimes, they will speak _____ because their minds are not clear. To get rid of the habit, people need to sleep early and do some sports. A healthy body and a clear mind will make them feel good all day. improper uncomfortable impatient nonsense Activity 2 Use need to do / don’t need to do / needn’t do correctly Pair work. Read the conversation. Pay attention to need. What’s the matter with you You can watch the games online the next day. You needn’t stay up. You need to take care od yourself. I stayed up to watch the soccer game last night. I need to get some sleep now. OK. Thank you for your advice. need为实义动词，表示需要，其后加不定式。有人称变化 肯定结构：need to do sth. 需要做某事 否定结构：don’t need to do sth.不需要做某事 need还可做情态动词，其后加动词原型,无人称变化 肯定结构：need do sth. 需要做某事 否定结构：needn’t do sth.不需要做某事 Complete the table and learn how ... ...
