祈使句 + and + 陈述句结构 在这种句子结构中.祈使句表示条件.陈述句表示结 果.它相当于If you..., you will....另外.祈使句 + or + 陈述句结构表示:If (not)..., you will.有时候. 祈使句中的动词可省略. Work harder, and you'll find it not difficult to learn. 再用功一点.你就会发现它不难写. Hurry up, or you will be late. 快一点.否则你会迟到. More effort, and you can finish it in time. 再加把劲.你会按时完成它. [句型归纳] [考点1]Pierre and I did have a very good time at the ball. 皮埃尔与我确实在舞会上玩得很开心. 该句中的did为助动词.加强谓语动词have的语气. 在“助动词do / does / did + 动词原形 结构中.助动词 do / does / did意思是“确实.的确.一定 .常常用在 肯定句或祈使句中.起加强语气的作用.有人称和时 态的变化.例如: Do send me e-mail immediately you arrive at Beijing. 你 一到北京.一定要给我发电子邮件. He does smoke two packs of cigarettes every day. 他确 实每天抽两包烟. The company earned much more this month than it did last month. 公司本月赚的钱要比上个月多得多. [考例1] An awful accident , however, occur the other day. A. does B. did C. was to D. had to [考查目标] 对句子中谓语的强调. [答案与解析] B 助动词do 用于 对现在时态的强调,did用于对过去时态的强调.后面 均接动词原形. [考点2]In the eighteenth century, Benjamin Franklin conducted a number of experiments in which he showed what electricity is. 18世纪.本杰明·富兰克林做了一系 列的试验.以证明电是什么. 注意:该句子中的 a number of 作主语.谓语动词用复数 形式.例如: A number of children play video games online. 很多的 孩子在网上玩电子游戏. a number of意思是“许多.数目 .作主语时.谓语动词 用复数形式.the number of意思是“数量 .作主语时. 谓语动词用单数形式.例如: A number of people prefer to sending e-mail each other t0 writing letters. 许多人更愿意发电子邮件.而不愿意 写信. The number of milu deer is increasing year by year. 麋 鹿的数目在逐年增加. [考例2] The number of people invited fifty.but a number of them absent fnr different reasons. A. were; was B. was; was C. was; were D. were; were [考查目标] 主谓一致. [答案与解析] C 根据以上的解释.应该选was,were. [考点3]Having realized that I could use a kite to attract Iightning, I decided to do an experiment. 意识到可以用 风筝引来闪电之后.我便决定做个实验. 该句中的having realized是v-ing形式的完成式在句中 作状语. v-ing形式在句中的主要作用是作状语.having done表 示非谓语动词的动作先于渭语动词的动作.而且要注 意非谓语与句子主语之间存在着主动关系时.用hav- ing done,非谓语与句子主语之间存在着被动关系时. 用having been done,其否定形式是在v-ing前加not. 例如: Having finished his homework, the boy decided to play football for a while. 做完了作业．他决定去踢一会儿 球. Not having cleaned the classroom, they couldn't go home. 还没有打扫完教室.他们还不能回家. Having been praised in class, the girl felt very happy. 那个姑娘在班上得到表扬.感到很高兴. [考例3] from heart trouble for years, Professor White has to take some medicine with him wherever he goes. A. Suffered B. Suffering C. Having suffered D. Being suffered [考查目标]非谓语动词v-ing. [答案与解析]C v-ing形式的逻辑主语是Professor White.Professor White和suffer之间存在着主动关 系.而且根据.for years.表示 suffer 的动作持续换了 多少年.所以用v-ing完成式表示原因. [牛刀小试3] 【查看更多】
