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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________。
查看习题详情和答案>>掌握数词的用法非常重要，请做下面的练习，写出下列数词的序数词形式。
(1)one ________ two ________
three ________
(2)four ________ six
seven ________ ten
(3)five ________ twelve ________
(4)eight ________ nine ________
(5)twenty ________ thirty ________
forty ________ fifty ________
(6)sixty-one ________
seventy-two ________
eighty-three ________
ninety-five ________
one hundred and six ________
查看习题详情和答案>>掌握数词的用法非常重要，请你写出数字1～30，并总结规律。
(1)________ (2)________ (3)________
(4)________ (5)________ (6)________
(7)________ (8)________ (9)________
(l0)________ (11)________ (12)________
(13)________ (14)________ (15)________
(16)________ (17)________ (18)________
(19)________ (20)________ (21)________
(22)________ (23)________ (24)________
(25)________ (26)________ (27)________
(28)________ (29)________ (30)________
你总结出数词1～30有什么规律了吗？下面我们一起总结一下。
(1)从13～19都是以teen结尾，均读做/ti:n/除thirteen，fifteen外，fourteen，sixteen，seventeen，nineteen均是在four，six，seven，nine后加-teen；eighteen因eight是以“t”结尾，故直接加-een.
(2)twenty，thirty均是以-ty结尾，读做/ti／。从21～29均是在twenty后加“-”连字符，one，two，three…nine直接跟后。
查看习题详情和答案>>Helen Keller lived in the USA． She was a great① woman.
When Helen was a baby, she got very sick. After many weeks, the doctor said, “She is better, but now she can’t see and can’t hear②.” Her mother and father were very sad.
After a few years, things got worse. There was no way for Helen to speak to other people. She heard nothing. She saw nothing. She didn’t understand anything.
Then one day a teacher came to live with Helen and her family. The teacher helped Helen learn about words. Helen was very bright and she learned to spell her first word③. When she was older, she went to college.
Helen was very famous. She helped many blind and deaf（聋） people. She traveled around the world and helped many people.
Helen was a very old woman when she died. The world remembers her today as a brave（勇敢） and wonderful person. She was blind and deaf, but she found a way to see and hear④.
1．下列A、B、C、D中哪一项不能替代①：____________________.
A．famous B．wonderful C．popular D．grand（自负的）
2．完成句子，使其意思与划线②相同：
She can ____________________ see _________________ hear.
3．完成句子，使其意思与划线③相同：
Helen was ________________ bright ________________ she learned to spell her first word.
4．用文中单词进行词形变化：
clever（同义词）_____________ know（同音词）_____________
bad（比较级）_______________ one（序数词）_______________
5．完成句子，使其意思与划线④相同：
____________________ she was blind and deaf, she found a way to see and hear.
查看习题详情和答案>>| 根据所给基数词，写出相应的序数词。 | ||
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