当先行词是序数词修饰时.只能使用“that .例: He was the first person that passed the exam.他是第一个通过考试的人.——青夏教育精英家教网—

摘要：当先行词是序数词修饰时.只能使用“that .例: He was the first person that passed the exam.他是第一个通过考试的人.

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小博士：仔细观察下面的基数词和对应的序数词的区别和变化，你会发现这种变化是有规律的，你能归纳出来吗？请根据规律填出所缺的基数词和序数词，并特别注意黑体字的词。

one	first	eleven	eleventh	twenty-one	twenty-first
two	second	twelve	twelfth	twenty-two	twenty-second
three	third	thirteen	thirteenth	twenty-three	twenty-third
four	fourth	fourteen	fourteenth	twenty-four	______
five	fifth	fifteen	______	twenty-five	twenty-fifth
six	sixth	sixteen	sixteenth	twenty-six	twenty-sixth
seven	______	seventeen	seventeenth	twenty-seven	twenty-seventh
eight	eighth	eighteen	eighteenth	twenty-eight	twenty-eighth
nine	ninth	nineteen	nineteenth	twenty-nine	twenty-ninth
ten	tenth	twenty	twentieth	thirty	thirtieth
thirty-one	thirty-first fortieth ninetieth		hundred	hundredth
forty			thousand	thousandth
ninety			million	millionth

我找到规律了！请看：

1　　英语序数词1～19，除first，second，third等特殊形式外，其余的一般是在相应的基数词后加-th构成。

2　　有几个序数词加-th时拼法不规则，要注意。如fifth，________ ________ ________。

3　　十位整数的序数词的构成方法是先将其基数词的词尾“ty”中的“y”改为“i”，再加“-eth”。如________。

4　　基数词“几十几”变成序数词时，只需将个位数变成序数词，十位数不变。如________。

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你知道你亲爱的爸爸妈妈的生日吗？那么你每年可以吃三次生日蛋糕；你知道你爷爷奶奶的生日吗？那么你每年可以吃五次生日蛋糕；你知道你的好朋友们的生日吗？那么……如果你还不知道，还等什么？赶快去打听一下吧！

My father's birthday is ________.

My mother's birthday is ________.

My grandfather's birthday is ________.

My grandmother's birthday is ________.

My birthday is ________.

My best friend's birthday is ________.

小词典：大家一定记得以前我们学了one，two，three，four这样一组表示数目的数词，这类词叫基数词。这一单元我们学到了表示顺序的数词，如：first，second，third等，这类词叫序数词。每个基数词有一个对应的序数词。除了一些特殊的变化外，一般是在相应的基数词后加-th构成序数词。序数词前一般要加定冠词，如the first name(第一个名字，名)，the second day(第二天)，CharlesV 查理五世读作Charles the fifth.

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阅读

Who Is Fooled?

　　Just as the teacher was coming into the classroom, one of the boys, whose name was James, said loudly, “Teacher is a fool．” The teacher pretended not to have heard this．He went up to the platform and said,“ Today we are going to have a lesson on punctuation．Punctuation in a sentence is very important．Look at this sentence．” He picked up a piece of chalk and wrote the following sentence on the blackboard：James says the teacher is a fool．The class laughed．“Now,” continued the teacher, “with two commas I can change the meaning of the sentence entirely．” He then put in two commas and the sentence read：