he has a leg改爲否定句是he does not have a leg。題目的has不是助動詞，而是作爲一般動詞，意思是：有，所以改爲否定句不能直接用has，而要借用助動詞dose。協助主要動詞構成謂語的詞叫助動詞，也叫輔助動詞。被協助的動詞稱作主要動詞。助動詞用來構成時態和語態，具有語法意義，但除情態助動詞外沒有詞彙意義，不可單獨作謂語。常用的助動詞有：be、have、has、do、does、did、shall、should、will、would等。
he has a leg改爲否定句是he does not have a leg。題目的has不是助動詞，而是作爲一般動詞，意思是：有，所以改爲否定句不能直接用has，而要借用助動詞dose。協助主要動詞構成謂語的詞叫助動詞，也叫輔助動詞。被協助的動詞稱作主要動詞。助動詞用來構成時態和語態，具有語法意義，但除情態助動詞外沒有詞彙意義，不可單獨作謂語。常用的助動詞有：be、have、has、do、does、did、shall、should、will、would等。
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hehasaleg改爲否定句
he has a leg改爲否定句是he does not have a leg。題目的has不是助動詞，而是作爲一般動詞，意思是：有，所以改爲否定句不能直接用has，而要借用助動詞dose。協助主要動詞構成謂語的詞叫助動詞，也叫輔助動詞。被協助的動詞稱作主要動詞。助動詞用來構成時態和語態，具有語法意義，但除情態助動詞外沒有詞彙意義，不可單獨作謂語。常用的助動詞有：be、have、has、do、does、did、shall、should、will、would等。
He has a ball.(改爲否定句和一般疑問句 並作肯定，和否定回答。
常把has作爲實義動詞看待，其中has體現三單，故藉助助動詞does。
否定句：He
doesn't
have
a
ball.
一般疑問句：Does
he
have
a
ball?
肯定回答：Yes,
he
does.
否定回答：No,
he
doesn't.
he has a bird否定句的兩種形式
he has a bird否定句的兩種形式是在助動詞has 的後加一個not。例如：He has not a bird. 和 He hasn't a bird .
否定句是表示否定的句子。必須有否定詞，古代漢語中否定詞可以是副詞“不”、“弗”、“毋”、“勿”、“未”、“否”、“非”，可以是動詞如“無”。
否定句分類
一般否定句
I don't know this. No news is good news.
There is no person（smoking）／not a person/not any person（smoking）in the house.
特指否定
He went to his office, not to see him.
I am sorry for not coming on time.
I don't think / believe/suppose / feel / imagine you are right.
部分否定
All the answers are not right
All is not gold that glitters
I don't know all of them.
I can't see everybody/everything.
Both of them are not right.
全體否定
None of my friends smoke.
I can see nothing/nobody.
Neither of them is right.
Nothing can be so simple as this.
延續否定
You didn't see him, neither/nor did I.
You don't know, I don't know either.
He doesn't know English, let alone / to say nothing of/not to speak of（更不用說）French.
半否定句
We seldom/hardly/scarcely/barely hear such fine singing.
I know little English. I saw few people.
雙重否定
You can't make something out of nothing.
What's done cannot be undone.
There is no sweet without sweat.
No gain without pains.
I can't help /keep/ laughing whenever I hear it.
No man is so old but（that）he can learn.
排除否定
Everyone is ready except you.
He did nothing but play.
But for your help, I couldn't do it.
加強否定
I won't do it at all.
I can't see it any more.
He is no longer a bo.
He has a football.改成否定句has要不要變回原型?
He has a football.當這個句式變爲否定句時,在主語he後,實意動詞has前要加doesn't,而後面的has必須要回原形!所有的謂語動詞是單三這種情況時,變否定句式都要把動詞變爲原形.
he has a blue and white sweater的否定句？
這個句子中沒有情態動詞和be動詞，藉助動詞幫忙變成否定，has還原爲have.
否定句：He doesn't have a blue and white sweater.
blue and white 藍白相間 ，所以這裏變爲否定句不需要把and 變爲or.
舉例說明如何把含有have和has的句子變成否定句
例1：I have a pen.
I have a pen.
have用於除第三人稱單數外的人稱實義動詞，變否定句不能在have後加not，則需要助動詞來幫助解決。do+not= don’t。
例2：My father has a watch.
My father doesn't have a watch.
has 用於第三人稱單數外的人稱實義動詞，變否定句不能在has後加not，則需要助動詞來幫助解決。does+not=doesn't
注：變第三人稱單數是，要注意動詞部分的還原。
have怎麼變否定句？？
表示“have”的否定句，在have前加“don’t”，就是don’t have。
表示“has”的否定把“has”改爲have，再在前面加“doesn’t”，就是doesn’t have。
在have/has的否定，不能直接在has/have後面加上not，而是需要藉助到助動詞do/does的否定形式don’t/doesn’t，再加上have。這時候don’t和doesn’t的選擇是由主語的人稱來決定的。第三人稱單數(he, she, it)用doesn’t，其他都用don’t。因此否定句的句型爲：主語+don't (doesn't)+have +…。
擴展資料：
has和have用於一般疑問句
在一般疑問句中，我們同樣需要藉助到助動詞Do/Does來幫助我們實現疑問的功能，結構爲：Do (Does)+主語+have+…?。而對於Do或Does的疑問句，回答的時候也同樣需要用do或does:
肯定回答用：Yes, 主語+do (does).
否定回答用：No, 主語+don't (doesn't).
例如：
—Do you have a ruler? 你有尺子嗎?
—Yes, I do., I don't. 是的，我有。/不，我沒有。
—Does Lucy have a twin sister? 露茜有個孿生姐姐嗎?
—Yes, she does., she doesn't. 是的，有。/不，沒有。
He has a good friend 該爲否定句時，爲什麼has要改爲have
答案是：
因爲he是 第三人稱單數，所以改成疑問句或者
否定句時應該加上助動詞does，再加上助動詞之後
應該把動詞改爲原形，因此
has
應該
改爲have
He
doesn't
have
a
good
friend
☞
♧手工翻譯☀尊重勞動☀歡迎提問☀感謝採納♧
☜
hehasafarm改爲否定句
應爲：He does not have a farm.
肯定句變否定句的方法：
1.含be動詞：Be動詞後加not
2.含有實義動詞的肯定句改否定句：
實義動詞前加do not/does not/did not
3.含情態動詞的，直接在情態動詞後加not
he has a bowl改爲否定句
He doesn't have a bowl。
原句He has a bowl.改成否定句，首先看句中是否有助動詞，沒有就加助動詞，這裏根據主語he，且時態爲一般現在時，加助動詞does的否定式並把實義動詞has改回原型have即可。
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