1、单元语法小专题(Grammar Focus)语法精讲一、祈使句祈使句常用来表示命令、指示、请求、要求或建议等。1当主语是第二人称you时，you通常被省略。这种祈使句一般以动词原形开头。它的否认形式是在动词原形前加Dont。如：Be more careful next time.下次仔细点。Come to school earlier next time.下次早点来学校。Dont play computer games.不要玩游戏。在祈使句的句首或句尾加please，可以使祈使句的语气更委婉。注意：在句尾加please时，要在please前加逗号。如：Please speak loudly.S
2、peak loudly，please.请大声讲话。2带有第一、第三人称主语的祈使句通常以let为引导词，一般用来提建议。如：Lets watch the cartoon now.现在我们看卡通片吧。Lets/Let me祈使句的否认形式是Lets/Let me not或Dont lets/let me ；“Let 第三人称的否认形式为Dont let 第三人称 。如：Lets not play soccer in the street.我们不要在街上踢足球。Dont let her watch so much TV.不要让她看这么多电视。二、可数名词与不可数名词普通名词分为可数名词和不可数名词
3、。1可数名词可以用具体的数词来修饰，也可以用“数词计量名词 of 可数名词的复数形式来表示。如：three apples三个苹果；two bags of watermelons两袋西瓜2不可数名词没有复数形式，表示量时用“数词 计量名词 of 不可数名词结构。如：a cup of milk一杯牛奶3可数名词的量可以用how many提问；不可数名词的量可以用how much提问。4some，any，a lot of，lots of等既可以修饰可数名词，又可以修饰不可数名词。语法精练.用括号内所给单词的适当形式填空。1_(keep) quiet in the library.2Dont _(sw
4、im) in the river，please.3Please dont _(be) late for school next time.4You should not eat too much _(meat)5They visited two big _(factory) last month.6There _(be) some bread on the table. You can have some.7Would you like to buy some _(salt), Mrs. Smith8Both his uncle and his aunt are famous _(scient
5、ist)9How much _(coffee) is there in the cup10How many _(watermelon) did you buy yesterday.按要求完成以下句子，每空一词。11You must listen to the teacher carefully. (改为祈使句)_ _ the teacher carefully，please.12You cant pour the water into the pot. (改为祈使句)_ _ the water into the pot.13I have two brothers. (对画线局部提问)_ _ b
6、rothers do you have14There is a little honey in the fridge.(对画线局部提问)_ _ _ is there in the fridge15There is a tomato in the box.(用three代替a改写句子)There _ three _ in the box.根据汉语意思完成句子，每空一词。16请看第二幅图。_ _ the second picture，please.17会议室里有几位工程师？_ _ _ are there in the meeting room18凯特，请不要翻开搅拌机。Kate，please _ _ _ the blender.19我们一起做香蕉奶昔吧。_ _ banana milk shake together.20我想要一杯酸奶和两个汉堡包。I would like _ _ _ _ and two _单元语法小专题(Grammar Focus)9coffee to12.Dont pour many much honey15are；tomatoes at many engineers18.dont turn on19.Lets make cup of yogurt；hamburgers