Add st if it ends with one, for example: first-1st

Add nd if it ends with two, for example: second-2nd

Add if it ends with three rd, for example: third-3rd

For others, add th, for example: fourth-4th fifth-5th…

1. First category

first (1st ) First

second (2nd) Second

third (3rd) Third

(The abbreviations in brackets are after the Arabic numerals. Including the last two letters of the corresponding ordinal words, the following types are the same.) There are only three ordinal words of this type, which are special among the whole ordinal words. Just like the first type of cardinal number words, they need to be hardened one by one. Write it down.

2. The second category:

fourth (4th) fourth

fifth (5th) fifth

sixth (6th) sixth

seventh (7th) seventh

eighth (8th) eighth

ninth (9th) ninth

tenth ( 10th) tenth

eleventh (11th) eleventh

twelfth (12th) twelfth

thirteenth (13th) thirteenth

fourteenth (14th) fourteenth

fifteenth (15th) fifteenth

sixteenth (16th) sixteenth

seventeenth (17th) Seventeen

eighteenth (18th) Eighteenth

nineteenth (19th) Nineteenth

There are sixteen ordinal words of this type. They are all formed by adding the suffix -th after the corresponding cardinal number. Pay attention to the spelling of the four words fifth, eighth, ninth, and twelth.

3. The third category:

twentieth (20th) twentieth

thirtieth (30th) thirty

fortieth ( 40th) fortieth

fiftieth (50th) fiftieth

sixtieth (60th) sixtieth

seventieth (70th) seventieth

eightieth (80th) Eighty

ninetieth (90th) Ninetieth

This category is all ordinal words with ten integers, ***eight. Their formation method is: first change the y in the suffix -ty of the corresponding ten-digit integer to i, and then add the suffix -eth.

4. Category 4:

Thirty-first (31th) Thirty-first

Sixty-second (62nd) Sixty-second

eighty-seventh (87th) Eighty-seven

ninety-eighth (98th) Ninety-eight

This type of ordinal word that expresses "the tenth" , as simple as the cardinal word expressing "tens". In terms of composition method, they are all changed from the cardinal numeral word "tens". The tens digit remains unchanged, and only the cardinal numeral word in the units position is changed into an ordinal number word.

Extended information:

Ordinal numbers can be used as subjects, objects, attributives and predicates in sentences.

The second is what I really need． The second one is what I really need. (as subject)

He chooses the second． He picked the second one. (as object)

We are to carry out the first plan. We will execute the first plan. (attributive)

She is the second in our class. She is second in our class. (As a predicate)

Note: When an ordinal number is used, it is usually preceded by the definite article the; but if the indefinite article a or an appears before the ordinal number, it means "again... ...","again......".

Baidu Encyclopedia-Ordinal Words