英语数词讲解

数词(Numeral)数词：表示数量或顺序的词叫做数词数词分为两大类，即基数词和序数词。基数词表示数目:one,two,three,four……;序数词表示顺序:first,second,third,fourth……序数词的缩写形式为阿拉伯数字加序数词的最后两个字母.如:first---1st;second---2nd;third-3rd;序数词前一般要加the。有时序数词前面可加不定冠词来表示再一，又一这样的意思。ShallIaskhimathirdtime?我还要再问他一次吗?用法：数词可以作句子的主语、宾语、表语和定语，同位语(1)作定语Thereareonlythreeboysintheclass.Tenpeoplewillcometotheparty.(2)作主语。Threeofthemwillplayfootball.Thesecondwasbetter.用法：数词可以作句子的主语、宾语、表语，定语，同位语(3)作宾语Itisworththreehundred.Hewasamongthefirsttoarrive.(4)作表语。Iameighteen.Shewassecondinherclass.Twoandtwoisfour.(5)作同位语。Areyoutwocoming?Whoisthewoman,thesecondinthesecondline?用法：数词可以作句子的主语、宾语、表语，定语，同位语(3)作宾语Itisworththreehundred.Hewasamongthefirsttoarrive.(4)作表语。Iameighteen.Shewassecondinherclass.Twoandtwoisfour.(5)作同位语。Areyoutwocoming?Whoisthewoman,thesecondinthesecondline?倍数的表示：1)倍数+形容词/副词比较级+than，用…times表示。Thegirlistentimesclevererthanherbrother.2)如果表示是……两倍数，一般用twice。Myroomistwiceaslargeasyours.3)倍数+as+形容词/副词/名词+asHisapartmentisthreetimesaslargeasthatofmine.4)倍数+名词ThevolumeoftheSunisabout1,300,000timesthatoftheearth.基数词找规律记忆：百內数找清规律很容易，十二以内词名异;十三数到十九去，后加-teen莫忘记。二十、三十至九十，整十之后有-ty;如果要说几十几，中间-号别丢弃，hundred是一百，请你记住莫大意。序数词记忆找规律：百內数一,二,三要全变;(one-first;two-second;three-third)其余都加th,th里有例外,8去t,(eight-eighth)9去e(nine-ninth)字母f代ve(five-fifth;twelve-twelfth);ty变成tie(twenty-twentieth)若要变化几十几，只变个位就可以(twenty-one-twenty-first)