L
Lawrence
旁
旁白
Catherine和Neil讲解了序数词（如first, second, third）的概念和用法，并与基数词（如1, 2, 3）进行了对比。他们解释了如何将基数词转换为序数词，通常是在基数词后添加'th'，但'1st, 2nd, 3rd'例外。他们还讨论了一些序数词的不规则拼写，例如'fifth', 'eighth', 'ninth', 'twelfth'以及以'Y'结尾的数字转换为序数词的规则。此外，他们还讲解了在日期表达中序数词的用法，以及序数词在表示空间位置和品质等级方面的应用，并指出序数词可以用作形容词和副词，且可以不用冠词'the'。
Lawrence的例子说明了序数词在实际生活中的应用，例如他描述了自己的18岁生日派对是在5月25日举行的，并提到了他在舞蹈比赛中获得第二名。这进一步阐释了序数词表示顺序和位置的用法。
Deep Dive
What date was Lawrence's 18th birthday party?
Lawrence's 18th birthday party was on the 25th of May.
What is the difference between ordinal and cardinal numbers?
Ordinal numbers indicate position (e.g., first, second), while cardinal numbers are used for counting (e.g., one, two).
How do you convert cardinal numbers to ordinal numbers?
Add 'th' to the end of a cardinal number (e.g., 18 becomes 18th). Exceptions are 1st, 2nd, and 3rd.
What are some irregular ordinal number spellings?
Examples include fifth (F-I-F-T-H), eighth (E-I-G-H-T-H), ninth (N-I-N-T-H), and twelfth (T-W-E-L-F-T-H).
How do you write ordinal numbers ending in 'Y'?
Drop the 'Y' and add 'ieth' (e.g., 60 becomes sixtieth).
When do you use the word 'of' in dates?
Use 'of' when stating the day before the month (e.g., the 25th of May).
Can ordinal numbers be used as adjectives or adverbs?
Yes, they can. For example, 'he won second prize' uses 'second' as an adjective.
What is the correct way to say 'my 21st birthday'?
The correct phrase is 'my 21st birthday' without 'the'.
This chapter introduces ordinal numbers, explaining their function, usage, and irregularities. It provides examples in different contexts and clarifies common mistakes.
- Ordinal numbers indicate position (e.g., first, second, third).
- They are used with dates, rankings, and positions.
- Irregular forms exist for 1st, 2nd, and 3rd; others generally add 'th' (with spelling exceptions).
- Usage includes 'the' and 'of' with dates (e.g., the 25th of May), and possessive adjectives (e.g., my 18th birthday).
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