一、基數(shù)詞及其主要用法
表示數(shù)目的詞稱基數(shù)詞。15 fifteen，幾百幾千不加s，242 two hundred and forty-two，5058 five thousand and fifty-eight，9，600，000 nine million six hundred thousand
1.基數(shù)詞可以用于數(shù)字的計(jì)算。
6+8=14 Six plus eight is fourteen.
9-7=2 Nine minus seven is two.
7X5= 35 Seven times five is thirty-five.
8÷4=2 Eight divided by four is two.
2.基數(shù)詞可以表示人的大致年齡和年代。
He died in his fifties.
This took place in 1990s/1990s.
The professor became successful in his thirties.
3.基數(shù)詞可以用來(lái)表達(dá)年份、時(shí)間、電話號(hào)碼。
1700 seventeen hundred
1814 eighteen fourteen
9：20 nine twenty
11：30 eleven thirty/ half past eleven
5：45 five forty-five/ a quarter to six
88760231 eight eight seven， six zero two， three one
4.基數(shù)詞可以用于編號(hào)。
Number six， line 4， page 19， Bus(No.) 332， Platform (No.) 5， Room 101
5.基數(shù)詞可以和其他詞一起構(gòu)成合成形容詞，在句子中作定語(yǔ)。
A one-month-old baby can recognize its mother by smell.
This eleven-month-old baby can speak a few words.
(The baby is eleven months old.)
The teacher asked us to write a four-thousand-word essay as our homework.
(There are four thousand words in the essay.)
This four-paragraph essay is too difficult for me to understand.
(There are four paragraphs in this essay. )
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