One: one

Two: two

Three: three

Four: four

Five: five

Six: six

Seven: seven

Eight: eight

Nine: nine

Ten: ten

Eleven: eleven

Twenty: twelve

Thirteen: thirteen

Fourteen years old

Fifteen: fifteen

Sixteen: sixteen

Seventeen: seventeen

Eight: eighteen

nineteen years old

Twenty: twenty

Second, ordinal number

First ( 1st) first

Second second

the third time

the fourth time

Fifth session

Sixth session

Seventh session

The eighth (eighth)

Ninth session

Tenth (10)

Eleventh session (1 1 session)

Twelfth (12) Twelfth

Thirteenth session (13)

14th session (14th session)

Fifteenth (15) Fifteenth

16th (16th) 16th

Seventeenth (17) Seventeenth

18th session (18th session)

Nineteenth (19) Nineteenth

Twentieth (twentieth)

Cardinal words: words representing numbers are called cardinal words.

Its form is as follows:

(1) From1—10 One, two, three, four, five, six, seven, eight, nine, ten.

(2) from11-19 eleven, twelve, thirteen, fourteen, five, sixteen, seven, eight, nine.

Except eleven, twelve, thirteen, five and eighteen are special forms, fourteen, sixteen, seventeen and nineteen are all composed of their single-digit forms followed by the suffix -teen.

Baidu Encyclopedia-Basic Vocabulary