2、Su Hai isn't fatter than me是用doesn't还是就是isn't啊
1. are your hair as long as hers？改错是are改成IS嘛还是把your改成you啊
3.  Does boy jumps higher than the girl? jump要去掉S嘛？

好像没错呀，呵呵我们在商量商量

不是都用doesn't嘛

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2、Su Hai fatter than me（）<BR>you are shorter than he，是he还是him啊，不是宾格嘛<BR><FONT size=2><FONT color=#999999>honey84cici 发表于 2009-3-9 09:42</FONT> <A href="https://www.njzxxyy.com/bbs/redirect.php?goto=findpost&amp;pid=364717&amp;ptid=37489" target=_blank><IMG alt="" src="https://www.njzxxyy.com/bbs/images/common/back.gif" border=0></A></FONT>

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<P>Su Hai fatter than me.不是少了is吗?</P>
<P>You are shorter than he.是正确的.</P>

把are改成is吧
头发不可数

回答当然是theirs  are

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2、Su Hai isn't fatter than me是用doesn't还是就是isn't啊<BR>1. are your hair as long as hers？改错是are改成IS嘛还是把your改成you啊<BR>3.&nbsp;&nbsp;Does boy jumps higher than the girl? jump要去掉S嘛？<BR><FONT size=2><FONT color=#999999>honey84cici 发表于 2009-3-9 09:42</FONT> <A href="https://www.njzxxyy.com/bbs/redirect.php?goto=findpost&amp;pid=364717&amp;ptid=37489" target=_blank><IMG alt="" src="https://www.njzxxyy.com/bbs/images/common/back.gif" border=0></A></FONT>

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<P>2用isn't,里面没有行为动词,怎么能用doesn't 呢.</P>
<P>1把are 改为is ,因为比较的是你的头发和她的头发,用your hair,而hair又是不可数的.所以用is.</P>
<P>3已经有助动词Does,所以句子中的行为动词要用原形,jumps,去s.</P>

isn't
is
jump
就这么办，没什么问题

第一句用isn't，因为be动词后跟形容词。
第二句用is，因为头发是不可数名词。
第三句用动词原形，因为第三人称单数已经用在助动词does上了。
这样看是不是更清楚了。

我赞同江纯水的观点，理由很充分。