其他應(yīng)注意的數(shù)的表達(dá)形式
1)a three-year-old boy 比較The boy is three years old
2) five thousand people / several thousand people比較 thousands of people
表達(dá)具體數(shù)字時(shí)，thousand不加 "s"，后面不加 "of "； ten， million， billion情況以此類推。
3) One-third of the students have passed College English Test Band IV.
Two-thirds of the students have passed College English Test Band IV.
One-third of the population in this area is living below the poverty line.
（這個(gè)地區(qū)有1/3人口生活在貧困線以下。)
注意：幾分之幾的表達(dá)形式；動(dòng)詞的單復(fù)數(shù)由后面的名詞數(shù)決定。
4) a looker-on 比較two lookers-on（旁觀者) / a brother-in-law比較two brothers-in-law（姻親兄弟)
5) my father， together with （along with / with / as well as my mother and brothers) 結(jié)構(gòu)中，主語(yǔ)作單數(shù)處理，即my father
