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1、動詞三單變化規(guī)則1.一般直接在詞尾加s，如：work-works?,live-lives?,make-makes?2.以s,x,ch?,sh等結(jié)尾的單詞加es?,?如：miss-misses?,fix-fixes?,finish-finishes?,teach-teaches?3.以輔音字母加y結(jié)尾的單詞，變y為i加es?,?如：fly-flies?4.以輔音字母加o結(jié)尾的單詞，加es如:?go-goes,?do-does?大家都知道，在一般現(xiàn)在時中，當主語是第三人稱單數(shù)時，謂語動詞要用第三人稱單數(shù)形式，即常在動詞原形后-s或-es
2、。但有些同學(xué)們對于哪些主語是第三人稱單數(shù)還不十分清楚，現(xiàn)歸納總結(jié)如下一、人稱代詞he,?she,?it是第三人稱單數(shù)。如：?He?likes?watching?TV.?????他喜歡看電視。?She?has?lunch?at?twelve.???她十二點吃午餐。?It?looks?like?a?cat.?????它看起來像只貓。?二、單個人名、地名或稱呼作主語；是第三人稱單數(shù)。如：①?Han?Mei?looks?like?her?mother.???韓梅看起來像她的母親。②?Beijing?is?in?China.???????北京
3、在中國。③Uncle?Wang?often?makes?cakes.???王叔叔經(jīng)常做蛋糕。?三、單數(shù)可數(shù)名詞或"this?/?that?/?the+單數(shù)可數(shù)名詞"作主語時，是第三人稱單數(shù)。如?①A?horse?is?a?useful?animal.?馬是有用的動物。4②This?book?is?yours.?這本書是你的。③?That?car?is?red.?那輛小汽車是紅色的。④The?cat?is?Lucy's.?這只貓是露茜的。?四、不定代詞someone,?somebody,?nobody,?everything,?som
4、ething等及指示代詞this,?that作主語時，是第三人稱單數(shù)。如：①Everyone?is?here.?大家到齊了。②There?is?something?wrong?with?the?watch.?這塊手表有毛病?③?This?is?a?pen.?這是一支鋼筆。④?That?is?an?eraser.?那是一塊橡皮擦。?五、不可數(shù)名詞作主語時為第三人稱單數(shù)。如：①The?milk?is?in?the?glass.?牛奶在玻璃杯里。②The?bread?is?very?small.?那面包很小。六、當數(shù)字或字母作主語時，看作
5、第三人稱單數(shù)。如：?①"6"?is?a?lucky?number.?"6"是個吉利數(shù)字。?②"I"?is?a?letter.?"I"是個字母。第三人稱單數(shù)形式的構(gòu)成動詞三單的練習一、寫出下列動詞的三單數(shù)形式1.work_______2.watch_________3.clean________?4.write_______5.teach_______6.4wash__________7.have_______8.read________?9.go__________?10.do__________11.fly________?12.
6、study_______13.She_________(watch)TV.I__________(watch)TV.?二、.?根據(jù)括號里單詞的適當形式填空.1.?She?_____?(be?)?a?writer.?2.?It?_____(look)?like?a?monkey.?3.?We_____(go)?to?the?park.?4.?He?_____(go)?to?school.??5.?Amy_____(like)?eating?fruits.?6.?Hebei_____(be)?next?to?Shandong.?7.?O
7、ur?teacher?_____(be)?talking?with?John.?8.?Whose?book?_____(be)?this???9.?Dogs?_____(be)?our?friends?.?10.?That?blackboard?_____(be)?clean.?11.?The?desk?_____(be)Tom’s.?12.?Somebody?_____(do)?her?homework?.?13.?Everybody?_____(is?)?ok!?14.?Nobody?_____?(be)in?the?park?
8、.?15.?There?_____besomeone?in??the?classroom?.?16.?That?cat?_____(be?)?mine?.?17.?A?little?water?_____(be)?in?the?cup
