1、7上Unit4Grammar（时间介词&频度副词）一、表示时间的介词。时间状语往往由介词短语充当，不同的时间所使用的介词也不相同，最常用的三个介词是at, on, in。 1) at 1. 在钟点时间前 at six oclock2. 在一日三餐前 at breakfast3. 在无day的节日前 at Christmas4. 在具体年龄前 at 8 years old2）on1. 在星期 名称前 on Monday2. 在某月某日前 on 15th July3. 在某月某日的早中晚前 on the morning of 20124. 在有day的节日前 on May Day3）in 1. 在
2、一天早中晚前 in the evening 2. 在月份前 in February3. 在年份前 in 20184. 在季节前 in spring 注意：在没有day节日前用 at。如： 1. Christmas 圣诞节2. Spring Festival 春节 3. Dragon Boat Festival龙舟节4. Mid-autumn Festival 中秋节 5. Halloween 万圣节前夜在有day节日前用 on。如：1. New Years Day 元旦节 2. Childrens Day 儿童节 3.May Day 五一节 4.Mothers Day 母亲节5.Fathers
3、 Day 父亲节 6.Teachers Day 教师节 7.Thanksgiving Day 感恩节 二、频度副词。.always, usually, often, sometimes, seldom, never等词被称为频度副词，可与一般现在时连用，表示事情发生的频率，它们表示的频率由高到低为:always (总是)usually(通常)often (经常)sometimes(有时)seldom(很少)never(从不)Tips小贴士 1.） never 反义词 always ; often 反义词 seldom2.） never 和 seldom表示否定 sometimes 、often
4、 、usually 、always表示肯定3.）频度副词还有：every+段时间 (day/week/month-etc); 次数+段时间：once/twice/three times a year-etc4. ）sometimes=at times=from time to time5. ) sometimes/some times/sometime/some time的区别：Sometimes有时some times 一些次sometime 某个时候 some time 一段时间.how often是对表示频度副词的时间状语的提问，可翻译为“多久(一次)”。如： How often do
5、you eat junk food? Never. How often does Eddie walk to your bowl? -Many times a day. How often does Amy write to her friend? -Every month.频率副词在句中的位置：“Be后 ”、“行前”、“助行间”。1. ） 频率副词用在动词be后。如：It is usually hot in summer. 夏天天气通常是热的。2. ） 频率副词用在行为动词前。如：My father usually walks home.我的父亲经常步行回家。 3. ）频率副词用在助动词do
6、/does的后面行为动词的前面。如：We do not often go to the cinema.我们不经常去看电影。 频率副词的注意要点(一) v 在简答句中，频率副词必须放在 be 动词或助动词的前面。v Are you usually busy at home? Yes, I usually am. v Do they often ride a bicycle to school? Yes, they often do.频率副词的注意要点 (二)v sometimes 通常放在一般动词的前面，但也可放在句尾。如果要加强语气，则放在句首。 例： She sometimes goes b
7、y car. 一般位置 = She goes by car sometimes. 在句尾 = Sometimes she goes by car. 表示加强语气 频率副词的注意要点 (三)v often 如果被 very 或 quite 修饰时，则放在句尾。He often calls me. 一般位置He calls me very often. 在句尾频率副词的注意要点 (四)v 频率副词 usually 与 sometimes 的特殊位置如下： 1. sometimes + 否定 ( not ) 例 1： He sometimes doesnt work on Monday. 2. us
8、ually +否定 ( 或否定 + usually ) 例 2： It doesnt usually rain in November. = It usually doesnt rain in November.频率副词的注意要点 (五)v 频率副词 ever 与 never 的用法区別如下： 1. ever 用于疑问句。 2. never 用与否定回答，句首有 No， 但不可和 not 连用。 例： Do you ever play soccer? ever用于疑问句 No, I never play soccer. 否定回答 No, never. 否定简答句频率副词的注意要点 (六)v 否
9、定词 never 和 seldom 可以放在句首形成倒装句，用于加强句子的语气。 例1：She is never late to school. 一般句子 = Never is she late to school. 倒装句 例2：She seldom watches TV. 一般句子 = Seldom does she watch TV. 倒装句频率副词的注意要点 (七)v seldom 因具有否定的意味，故不可和not连用。 v He is seldom sick. - ( T )v He is not seldom sick. - ( F )频率副词的注意要点 (八)v never 有时
10、候可放在助动词前面，表示加强语气。 He can never use a computer. 一般句子He never can use a computer. 加强语气频率副词的注意要点 (九)v always 如果放在句首，是肯定祈使句，后面要接原形动词 例1：Always be a good boy, Tom. always 在句首； be 是原形动词v never 如果放在句首，是否定祈使句，后面要接原形动词 例2：Never be late to school, Tom. never 在句首； be 是原形动词频率副词的注意要点十v 频率副词 also 例： He sometimes
11、also takes a trip by plane.巩固练习：I、Fill in the blanks with in, on or at.1. We dont go to school _ Sunday.2. My birthday is _ April 1st.3. Were going to see the doctor _ four oclock.4. He often takes Eddie for a walk _ the evening.5. They have a long holiday _ November.6. He was born _ 1992.7. He like
12、s reading newspapers _ breakfast.8. She starts learning English _ 6 oclock.9. Its cold _ winter in China. 10. They play the game _ the evening of 31st October.11. Sally usually goes to bed _ 9:30 p.m.12. How many days are there _February?13. Is Chinas Got Talent (中国达人秀) _ Sunday evening?14. My mothe
13、r doesnt go to work _ Womens Day.15. Grandpa always reads newspapers _ the morning.16. Harbin is a good place to visit _summer.17. We have Music _ Wednesday.18. Chairman Mao died (去世) _ 83 years old.19. Hey, Alice! Is your birthday _ 9 August?20. The 31st Olympic Games is in Rio _ 2016.21.My birthda
14、y is _ 6 May.22.The Open Day is _ Tuesday.23.I usually play tennis _ 3 oclock _ the afternoon.24.We have a long holiday _ October.25.I hope my dream can come true _ 30.26. He was born _ 1992.27. People are very happy _ Christmas . 28. She starts learning English _ six oclock.29. Its cold _ winter in
15、 China. 30. They play the game _ the evening of 31st October.31. We dont go to school _ Sunday.32. My birthday is _ April 1st.33. We always have a good time _ May Day .34. He often takes Eddie for a walk _ the evening.35. They have a long holiday _ November.、单项选择 1.The meeting is _ the morning. A. i
16、n B. on C. at D. from2. He started learning French _ 15th May. A. to B. for C. at D. on3. I dont like skiing at all. I _ go skiing. A.never B.seldom C.often D. sometimes4. Tom _ to work by bicycle.A. usually go B. go usually C. usually goes D. goes usually 5. We often eat dinner at home on weekends,
17、 but _ we eat out. A. sometimes B. seldom C. never D. always 6. Jerry _ for school. A. is usually late B. usually is late C. is late usually D. goes usually late . Complete the sentences.1.My brother drinks milk every day. (对划线部分提问)_ _ _ your brother _ milk?2.She usually does her homework at 7:00 pm
18、.(1)对usually提问 _(2)对at 7:00 pm提问_3.Im never late for school.(划线提问) _ _ _ you late for school?4. Eddie walks to his bowl many times a day. (划线提问) _ _ _ Eddie _ to his bowl?5. I go to the school library every day. (对划线部分提问)_ _ _you go to the school library?6.She often goes to the Reading Club.(划线提问) _
19、 she _ to the Reading Club?7.He seldom takes a taxi to go to school.(划线提问)_ _ _he _ a taxi to go to school? 8. We play ball games at 4:30 p.m. (对划线部分提问)_ _ _ you play ball games?9.He often plays football in the playground.(划线提问)_ _ _ he _ football in the playground? 10.Millie writes to her parents t
20、wice a month.(划线提问)_ _ _ Millie _ to her parents? 11.They dont have lessons every Saturday.(划线提问)_ _ _ they _ lessons? 12.She usually swims after school.(划线提问)_ _ _ she _ after school? 13.I have a glass of milk for breakfast every day.(同义句转换) I _ have a glass of milk for breakfast.14.I dont have ice cream in winter. Its too cold. (同义句转换) I_ have ice cream in winter.
