3、09000003．序数词的形式：如何由基数词变成序数词1）一至十九中除了第一，第二，第三，第五，第八，第九，第十二外，都在基数词后加-th。2）以-ty结尾的表示“几十”的基数词，先把y变为i，再加-eth3）表示“第几十几”时，十位数的“几十”仍用基数词，只把个位部分变成序数词就行了。三．分小组，课堂练习：单项选择 1. A ____ boy can sing the English song very well. （） A. ten-year-old B. ten years old C. ten-year
4、-old D. fifth years old 2. An hour later, _____ minister was sent to see the “magic cloth” woven by those two men.()A. two B. the second C. the two D. second 3、 Abraham Lincoln was ____ President of the United States. （） A. 16 B. the 16
5、C. 16th D. the 16th 4. Do you think there is any room for us ____ ? （） A. two B. the two C. second D. the second 5. How many students are there in your class? ___. （）A. Twenty nine B. Thirty and two C. Forty-five D. fifties 6. Wh
6、ich number is wrong? ___. （）A. Ninety B. Ninteen C. Ninth D. Nineteenth 7. The People's Liberation Army was founded ___. （） A. on August 1, 1927 B. in 1927, 1 August C. 1927 ，on August 1st D. in August 1, 1927 8. The number 4,123 is read _
7、___.（） A. four thousand one hundred and twenty-three B. four thousand and one hundred twenty-three C. four thousand and a hundred and twenty-three D. four thousands a hundred and twenty-three 9. The old professor still works hard though he is ___. （
8、） A. in his sixty B. in his sixties C. in sixties D. in the sixty 10. This classroom is ___ ours. （） A. three times big as B. as three times big as C. three times as
