一、基數詞及其主要用法
　　表示數目的詞稱基數詞。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.基數詞可以用于數字的計算。
　　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.基數詞可以用來表達年份、時間、電話號碼。
　　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.基數詞可以用于編號。
　　Number six， line 4， page 19， Bus(No.) 332， Platform (No.) 5， Room 101
　　5.基數詞可以和其他詞一起構成合成形容詞，在句子中作定語。
　　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. )