英语里面序数词是什么意思 ？序数词的意思 ？

What are ordinal numbers in English?

Ordinal numbers are a type of numeral that indicate the position or order of something in a series or sequence. In English, ordinal numbers are formed by adding the suffix "-th" to cardinal numbers, except for the numbers 1, 2, and 3, which have their own unique ordinal forms.

Using ordinal numbers in sentences

Ordinal numbers are used in a variety of contexts in English, such as dates, rankings, and fractions. For example:

1. Today is the 10th of November.
2. He came in 2nd place in the race.
3. She is the 3rd child in her family.
4. Half of the pizza is the equivalent of 1/2.

Ordinal numbers can also be used to indicate the order of events or steps in a process:

1. First, preheat the oven to 350 degrees.
2. Next, mix the flour and sugar together in a bowl.
3. Then, add the eggs and milk to the mixture.
4. Finally, pour the batter into a greased baking dish and bake for 30 minutes.

Exceptions to ordinal number rules

There are a few exceptions to the standard rules for forming ordinal numbers in English. For example, the numbers 11th, 12th, and 13th are irregular and do not follow the usual pattern of adding "-th" to the end of the cardinal number. Instead, they end in "-th" but also have additional letters:

1. Eleventh
2. Twelfth
3. Thirteenth

Additionally, some ordinal numbers are written as words rather than numerals, such as "first" and "second." These words are often used in formal writing or when emphasizing a particular order:

1. The first step in the process is to gather all the necessary materials.
2. The second reason why we should pursue this course of action is because...

Overall, ordinal numbers are an important part of English grammar and are used in a variety of contexts to indicate the order or position of something. By understanding the rules for forming and using ordinal numbers, you can improve your writing and communication skills in English.