Do和does用法解析

助动词包括do,does的用法do用于当主语是第一人称I,第二人称you及复数时（复数包括we,they,these,those及两个以上的人或者事物。does用于当主语是第三人称单数时（第三人称包括she,he,it,this,that,单独的事物或者人名等）。含有实义动词的句型结构变换一、肯定陈述句1当主语是I，you及复数时，谓语动词用原型。 Eg.Iknowit.（Eg.表示例如的意思） Theyhavetwovolleyballs. TinaandTomlikeicecream.2. 当主语是第三人称单数时（第三人称包括she,he,it,this,that,单独的事物或者人名等）。谓语动词要变为第三人称单数形式。P98特别要注意havehasEg.Shehasasetofkeys. Heknowsmyname. Tomneedsacomputergame.二、肯定陈述句变换成否定陈述句1当主语是I，you及复数时，在谓语动词前加donot=dont Eg.Idontknowit.Theydonthavetwovolleyballs. TinaandTomdontlikeicecream.2.当主语是第三人称单数时,在谓语动词前加doesnot=doesnt,谓语动词打回原型Eg.Shedoesnthaveasetofkeys. Hedoesntknowmyname.Tomdoesntneedacomputergame.3、 肯定陈述句变换成一般疑问句采用“一加二变三问号”。 一加：l当主语是I，you及复数时，在句子开头加do;l当主语是第三人称单数时（第三人称包括she,he,it,this,that,单独的事物或者人名等）,在句子开头加does; 二变：l变大小写;l第一人称变为第二人称（I/we变为you,my/our变为your）；l当主语是第三人称单数时,谓语动词要打回原型。三问号： 在句末加问号。肯定回答；Yes,主语+do/does.否定回答：No,主语+dont/doesnt.(主语要用相应的人称代词主格)Eg.Doyouknowit? Yes,Ido./No,Idont.Dotheyhavetwovolleyballs? Yes,theydo./No,theydont.Do Tinaand Tomlikeicecream? Yes,theydo. / No,theydont.Doesshehaveasetofkeys? Yes,shedoes./No,shedoesnt.Doesheknowyourname? Yes,hedoes./No,hedoesnt.DoesTomneedacomputergame? Yes,hedoes./No,hedoesnt.四、肯定陈述句变换成特殊疑问句（对画线部分提问）特殊疑问词+一般疑问句？（去掉画线部分）Eg.Theyhavetwovolleyballs.-Whatdotheyhave? Heknowsmyname.-Whatdoesheknow?Exercise1 ：把下列句子变成否定句，一般疑问句并做出肯否定回答，并对划线部分提问。1. Iknowtheanswer.否定句：I （know）theanswer.一般疑问句： you （know）heanswer?肯定回答： ,I .否定回答： , I .对划线部分提问：2Heplayssoccereveryday.否定句：He （play）soccereveryday.一般疑问句： he （play）soccereveryday?肯定回答： , He .否定回答： , He .3.Thebooksareontheteachersdesk.否定句：Thebooks (be) ontheteachersdesk对划线部分提问： are the books?Exercise21.I have been to Beijin(一般疑问句) _ _ _ to Beijin?2.We can see some birds.(一般疑问句)_ _ see _any_ birds?(any用在疑问句中，而some用在陈述句中)3.He designs clothes.(一般疑问句) _ he _ clothes?4.There were some flowers on the teachers desk.(一般疑问句)_ _ _ flowers on the teachers desk?5.There were some apples on the tree.(否定句) There _ _ _any_ apples on the tree.(any用在疑问句中，而some用在陈述句中)6.I think he is very old.(否定句) 7.Please colour it green.(否定句)I _ think he _ very old. _ _ colour it green. 8.You may have some hot dogs.(一般疑问句)_ _I_ _ _any_ _hot_ dog ?.10.This sign means “No smoking”. What _ this sign _?11.My pencils are in the pencil-box.(对划线部分提问)_ _ your pencils?12.I got up at six yesterday(对划线