(1) 基数(Cardinal numerals):one, two, three...
(A) 除one接单数名词外,其余均接复数名词。 He has one sister and three brothers.
(B) hundred的后面须加and(但可以省略)。 12,345 = twelve thousand three hundred (and) forty five;
(2) 序数(Ordinal mumerals):first, second, third...
(A) 序数前面必须附以定冠词。而a second, a third等,则是another的意思。
(B) 日期多用序数。 It’s on Friday, the fifth of October (= October the fifth = October 15th).
(C) 序数的简体。 9th = the ninth; 12th = the twelfth; 16th = the sixteenth;
(3) 分数:
(A) 分数的表示法:第一,分子用基数,分母用序数。第二,分子大于2时,分母须加“s”以形成复数。 1/2 = a (one) half; 1/3 = a (one) third; 2/3 = two-thirds; 1/4 = a (one) quarter;
(B) 分数可接与不可数名词;所接的名词是单数,则与单数动词连用,是复数则与复数动词连用。 A third of the peach was bad. A third of the bananas were bad.
(4) 倍数词:常用的有half, double, treble(三倍)等。
(A) half a, a half, half the +名词,表(一半的)。 He ran a half mile in half an hour. He ran half a mile in half an hour. I have read half the book.
(B) half还可作名词,代名词及副词。 Two halves make a whole. (名词) This is half as much again as that. (副词)
(C) 倍数常用的表达法: (half; double; treble; twice; two times; three times; four times...) +定冠词或所有形容词+名词或所有代名词 I had to pay double (= twice) the usual fare. That window is three times the size of this. |