12的序数词和基数词

12的序数词是"第十二"，基数词仍然是"12"。序数词用来表示事物的顺序或位置，而基数词用来计数。在英语中，"12"作为基数词表示数量，而"twelfth"作为序数词表示顺序。

Cardinal and ordinal numbers are fundamental in English grammar, used to express quantity and position, respectively. The number 12 serves as a practical example to illustrate these concepts.

Cardinal Number for 12: twelve

Ordinal Number for 12: twelfth

Cardinal Numbers 1-20

The cardinal numbers from one to twenty are as follows:

• one
• two
• three
• four
• five
• six
• seven
• eight
• nine
• ten
• eleven
• twelve
• thirteen
• fourteen
• fifteen
• sixteen
• seventeen
• eighteen
• nineteen
• twenty

Ordinal Numbers 1-20

Corresponding ordinal numbers for the first twenty positions are:

• first (1st)
• second (2nd)
• third (3rd)
• fourth (4th)
• fifth (5th)
• sixth (6th)
• seventh (7th)
• eighth (8th)
• ninth (9th)
• tenth (10th)
• eleventh (11th)
• twelfth (12th)
• thirteenth (13th)
• fourteenth (14th)
• fifteenth (15th)
• sixteenth (16th)
• seventeenth (17th)
• eighteenth (18th)
• nineteenth (19th)
• twentieth (20th)

Conversion Between Cardinal and Ordinal Numbers

Converting between cardinal and ordinal numbers follows specific patterns:

From Cardinal to Ordinal

• Add “th” to the end of the cardinal number.
• Exceptions for one, two, and three: first, second, third.
• Starting from four: change "ve" to "f", remove "t" from "eight", and drop "e" from "nine".
• For multiples of ten: change "ty" to "tie".
• For numbers in the teens: add "th" after the teen suffix.
• Special cases like "twenty-first" require the ordinal form of "one" to be added.

From Ordinal to Cardinal

• Numbers 0-12 have unique cardinal forms.
• Numbers 13-19 end with "teen".
• Multiples of ten end with "ty".
• For numbers in the form of tens plus ones: state the tens first, then the ones.
• Hundreds are denoted by "hundred".
• For hundreds plus ones: state the hundreds first, then the ones.
• Thousands are denoted by "thousand".