英语数词讲解.pptx

数词(Numeral)数词数词：表示数量或顺序的词叫做数词数词分为两大类，即数词分为两大类，即基数词基数词和和序数词序数词。基数词基数词表示数目:one,two,three,four;序数序数词词表示顺序:first,second,third,fourth序数词的缩写形式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。Shall I ask him a third time? 我还要再问他一次吗?用法用法：数词可以作句子的主语、宾语、表语和定语，同位语(1) 作作定语定语There are only three boys in the class. Ten people will come to the party. (2) 作主语作主语。Three of them will play football. The second was better.用法：用法：数词可以作句子的主语、宾语、表语，定语，同位语(3) 作作宾语宾语It is worth three hundred. He was among the first to arrive. (4) 作表语。I am eighteen.She was second in her class.Two and two is four. (5) 作同位语。Are you two coming? Who is the woman, the second in the second line? 用法：用法：数词可以作句子的主语、宾语、表语，定语，同位语(3) 作作宾语宾语It is worth three hundred. He was among the first to arrive. (4) 作表语。I am eighteen.She was second in her class.Two and two is four. (5) 作同位语。Are you two coming? Who is the woman, the second in the second line? 倍数的表示：倍数的表示：1)倍数倍数+形容词形容词/副词比较级副词比较级+than，用，用times表示表示。The girl is ten times cleverer than her brother.2)如果表示如果表示是是两倍数两倍数，一般用，一般用twice。My room is twice as large as yours.3)倍数倍数+as+形容词形容词/副词副词/名词名词+asHis apartment is three times as large as that of mine.4)倍数倍数+名词名词The volume of the Sun is about 1,300,000 times that of the earth.基数词找规律记忆：百內数基数词找规律记忆：百內数找清规律很容易，找清规律很容易，十二以内十二以内词名异词名异;十三数到十九去十三数到十九去，后加，后加-teen莫忘记。莫忘记。二十、二十、 三十至九十，三十至九十，整十之后整十之后有有-ty;如果要说如果要说几十几几十几，中间，中间-号别丢弃，号别丢弃，hundred是是一百一百，请你记住莫大意。，请你记住莫大意。序数词记忆找规律：百內数序数词记忆找规律：百內数一,二,三要全变;(one-first; two-second;three- third)其余都加其余都加th, th里有例外,8去t,(eight-eighth) 9去e(nine-ninth)字母字母f代代ve(five-fifth; twelve-twelfth);ty变成变成tie(twenty-twentieth)若要变化几十几，只变个位就可以(twenty-one-twenty-first)