Unit 4 When is Easter? 精讲精练 PB Read and write 【同步精讲】 基数词和序数词 在英语中，数词分为两种：基数词和序数词。如one, fifteen, twenty等表示数目的词被称为基数词；如first, twelfth, thirtieth等表示顺序的词被称为序数词。 一、“基”变“序”有规律： 1. 第1-19的序数词 除one→first，two→second, three→third有特殊形式外，其余序数词均由对应的基数词加th构成，其中有几个序数词拼法不规则，分别是five→fifth, eight→eighth, nine→ninth, twelve→twelfth。 2. 含十位整数的序数词 将相应的基数的词尾ty中的y变为ie，再加th, 如：thirty→thirtieth 3. 当表达第几十几时，十位数用基数词，个位变成序数词。如：twenty-two→twenty-second 二、用法不同 1. 基数词常用在可数名词前面，表示数量。如： There are forty- five students in our class. 在我们班有45名学生。 2. 序数词用来表示顺序。如：Father’s Day is on the third Sunday in June. 父亲节在六月的第三个星期日。 【同步精练】 一、读句子，圈出恰当的单词。 1. Today is my (ten / tenth) birthday. 2. There are (four / fourth) seasons in a year. 3. The puppy is (five / fifth) months old. 4. There are (twenty-nine / twenty-ninth) days in February this year. 5. Mr. Green lives on the (twelve / twelfth) floor in the building. 二、从方框中选出合适的单词补全句子，每词限用一次。 for diary second be noises 1. In the West, Monday is the _____ day of a week. 2. I’ll cook noodles _____ my mum on Mother’s Day. 3. They make _____when they are hungry. 4. Do you write a _____ every day? 5. The singing test will _____ on May 4th. 三、排列句子，使之成为一段完整的对话。 ( ) That’s Children’s Day! ( ) I’ll go on a picnic with my parents. ( ) Yes. It’s a special day. ( ) When is your birthday, Sam? ( ) What will you do then? ( ) My birthday is on June 1st. 四、按要求完成句子。 1. My grandpa’s birthday is on February 5th. （对画线部分提问） ______ ______ _______ grandpa’s birthday? 2. We’ll have a maths test on June 15th. （对画线部分提问） _____ _____ you _____ on June 15th? 3. eyes, on, are, 21st, their, April, open (.) （连词成句） ____________________________ 4. —Happy birthday! （写出答语） —____________________________ 五、读短文Two new kittens，补全信息。 My cat has two new kittens April 15th. They are pink because they are very . They still see. On April 21st, the kittens are days old. They make noises they are hungry. They have fur now. They are cute. On April 26th, there are open! They are . On May 3rd, the kittens can now. They can with Robin! 参考答案 一、1. tenth 2. four 3. five 4. twenty-nine 5. twelfth 二、1. second 2. for 3. noises 4. diary 5. be 三、364152 四、1. When; is; your 2. What; will; do 3. Their eyes are open on April 21st. 4. Thank you! 五、on, young, can’t, six, when, white, eyes, blue, walk, play 本文来源：https://www.wddqw.com/doc/34c4411cedfdc8d376eeaeaad1f34693dbef105b.html