祈使句 + and + 陳述句結構 在這種句子結構中.祈使句表示條件.陳述句表示結 果.它相當于If you..., you will....另外.祈使句 + or + 陳述句結構表示:If (not)..., you will.有時候. 祈使句中的動詞可省略. Work harder, and you'll find it not difficult to learn. 再用功一點.你就會發現它不難寫. Hurry up, or you will be late. 快一點.否則你會遲到. More effort, and you can finish it in time. 再加把勁.你會按時完成它. [句型歸納] [考點1]Pierre and I did have a very good time at the ball. 皮埃爾與我確實在舞會上玩得很開心. 該句中的did為助動詞.加強謂語動詞have的語氣. 在“助動詞do / does / did + 動詞原形 結構中.助動詞 do / does / did意思是“確實.的確.一定 .常常用在 肯定句或祈使句中.起加強語氣的作用.有人稱和時 態的變化.例如: Do send me e-mail immediately you arrive at Beijing. 你 一到北京.一定要給我發電子郵件. He does smoke two packs of cigarettes every day. 他確 實每天抽兩包煙. The company earned much more this month than it did last month. 公司本月賺的錢要比上個月多得多. [考例1] An awful accident , however, occur the other day. A. does B. did C. was to D. had to [考查目標] 對句子中謂語的強調. [答案與解析] B 助動詞do 用于 對現在時態的強調,did用于對過去時態的強調.后面 均接動詞原形. [考點2]In the eighteenth century, Benjamin Franklin conducted a number of experiments in which he showed what electricity is. 18世紀.本杰明·富蘭克林做了一系 列的試驗.以證明電是什么. 注意:該句子中的 a number of 作主語.謂語動詞用復數 形式.例如: A number of children play video games online. 很多的 孩子在網上玩電子游戲. a number of意思是“許多.數目 .作主語時.謂語動詞 用復數形式.the number of意思是“數量 .作主語時. 謂語動詞用單數形式.例如: A number of people prefer to sending e-mail each other t0 writing letters. 許多人更愿意發電子郵件.而不愿意 寫信. The number of milu deer is increasing year by year. 麋 鹿的數目在逐年增加. [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 [考查目標] 主謂一致. [答案與解析] C 根據以上的解釋.應該選was,were. [考點3]Having realized that I could use a kite to attract Iightning, I decided to do an experiment. 意識到可以用 風箏引來閃電之后.我便決定做個實驗. 該句中的having realized是v-ing形式的完成式在句中 作狀語. v-ing形式在句中的主要作用是作狀語.having done表 示非謂語動詞的動作先于渭語動詞的動作.而且要注 意非謂語與句子主語之間存在著主動關系時.用hav- ing done,非謂語與句子主語之間存在著被動關系時. 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. 做完了作業．他決定去踢一會兒 球. Not having cleaned the classroom, they couldn't go home. 還沒有打掃完教室.他們還不能回家. Having been praised in class, the girl felt very happy. 那個姑娘在班上得到表揚.感到很高興. [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 [考查目標]非謂語動詞v-ing. [答案與解析]C v-ing形式的邏輯主語是Professor White.Professor White和suffer之間存在著主動關 系.而且根據.for years.表示 suffer 的動作持續換了 多少年.所以用v-ing完成式表示原因. [牛刀小試3] 【查看更多】
