Chapter 4 Numbers：Everyone’s language
數詞概述：數詞是表示數目多少或順序先后的詞。數詞的種類： 基數詞和序數詞。1. 基數詞的構成1-12 單獨記： one, two, three , four, five, six, seven, eight, nine, ten, eleven, twelve13-19詞尾為-teen. e.g: thirteen, fourteen, fifteen20, 30, 40逢十詞尾為ty, twenty, thirty, forty21-99在十位數和個位數之間加連字符構成。eg: 73 seventy-three , 88 eighty-eight101-999光說幾百，再加and，再加末尾兩位數。eg: 178 one hundred and seventy-eight238 two hundred and thirty-eight1000 以上的數詞，先從后向前數， 每三位用一逗號隔開 第一個逗號表示thousand（千）， 第二逗號表示million(百萬)， 第三個逗號表示billion(十億)，然后一節一節用幾百幾十幾的方法。eg: 1004 one thousand and four147258 one hundred and forty-seven thousand , two hundred and fifty-eight18657421 eighteen million, six hundred and fifty-seven thousand , four hundred and twenty-one 注意：在這類數詞中hundred, thousand, million, billion等詞一般都用單數形式。2. 序數詞的記憶口訣：一，二，三要單獨記，one-first, two-second, three-thirdth 要從四加起, fourth, sixth,eight , 少個t, eighthnine 去掉e, nine-ninthv 要用f來代替five-fifth, twelve-twelfthty就成tie, twenty-twentieth若問“幾十幾”或“幾百幾”，只變個位記心里，twenty-one—twenty-first 重點句子：1. please have a seat.請坐。sit (v.) 動詞， 意思是坐，seat（n.）意思是座位。2. pay attention 注意3. add 3 and 9 ( 3 +9)4. subtract 3 from 9 (9-3)5. multiply 3 by 9 ( 3 ×9)6. divide 9 by 3 ( 9÷3)7. 3 plus 9 equals/is 12 ( 3+9=12)8. 9 minus 3 equals/ is 6 (9-3=6)9. 3 multiplied by 9 equals/is 27( 3×9=27)10. 9 divided by 3 equals /is 3( 9÷3=3)重點習題：1. this is a meeting of the world’s most ______ ( power, powerful) countries.2. i played tennis five ______ ( times, time) last week.3. the ______ ( alive , living) things can’t live without air or water.4. the chinese ______ ( invented, invention ) the compass.5. 13 is an ______ ( odd, even) number.6. he was ______ ( amusing, amused) to hear the news.7. ______ higher, and you will see the house. a if you stand b. to stand c. when you stand d. stand8. ______ forget to wire to me when you _____ get there next tuesday. a. don’t, will b. please, will c. please,/ d. don’t,/9. could you tell me _____ to do next? nothing more. let’s have a rest.a. why b. when c. what d. how