數詞是中考命題的熱點之一,同學們期望決勝中考,可千萬不能忽視這小小的數詞。下面我們就來了解數詞的一些基本用法。
1.基數詞變序數詞。其規(guī)律為:
1、2、3特殊記ffirst,second,third),加th從4起(fourth,fifth…),8少t,9去e,千萬別忘記(eighth,ninth);遇5逢12,ve變f.(fifth,twelfth),整20列整90,y要變ie(twentieth,thirtieth,…);若是幾十幾,前基(基數詞)后序(序數詞)別記錯(thirty-second)。
2.hundred,thousand,million,billion在構成具體的數目時用單數形式。如:
three hundred people
ten millian travellers
只有在表達不確定的數目時才加s,構成復數形式,如:
hundreds of數以百計的,成百上千的
thousands of數以千計的,成千上萬的
millions of數百萬的
這些詞組前不能用具體數字,不過我們可以說a few/many thousands/millions of…
另外,我們來了解一下數詞的下列用法:
twos and threes 三三兩兩地
tens of thousands of數以萬計的
hundreds of thousands of 數十萬的
He died still in his forties.他四十多歲就死了。
3.序數詞常與定冠詞the連用。如:
He is the first one to get to school every day.
The second truck carries more apples than the third one.
不過,序數詞前如果有其它詞修飾時,就要省略定冠詞。如:
This is our first lesson.
Please answer my second question.
4.與數詞有關的鐘點表達法。
a.順讀法(鐘點+分鐘),如:
3:30 讀成three thirty
8:45 讀成eight forty-five
10:15 讀成ten fifteen
b.倒讀法(分鐘+to/past+鐘點),如:
3:30 讀成half past three
8:45 讀成a quarter to nine
10:15 讀成a quarter past ten
在此,我們提一下分數和百分數的表達方法:
基數詞作分子.序數詞作分母。如:
1/5 讀成one fifth
1/3 讀成one third
若基數詞大于一,分母用復數。如:
2/7 讀成two sevenths
2/3 讀成two thirds
百分數更簡單,分子為基數詞,再加一個percent,如:
80% 讀成eighty percent
5.表示長度、時間、距離、金錢、號碼等的數詞作主語時,謂語動詞用作單數。如:
5,000,000 dollars is a lot ofmoney.
Ten years has passed since he cameto our school.
另外,還要提醒一下有關數詞的運算:
Five plus/and six is eleven.
Twenty minus one is nineteen.
Two times/multiplied by four is eight.
Fifteen divided by five is three.
責任編輯/張彩萍