1. 數(shù)字有時可以當(dāng)名詞或形容詞使用。當(dāng)名詞使用時，其詞尾可加-s/-es變?yōu)閺?fù)數(shù)形式。而當(dāng)形容詞使用時，其詞尾不能加-s/-es。 正確表達法
錯誤表達法
名詞：
hundreds of examples
形容詞：
three feet
an eight-foot-long tail
ten thousand people
two million years ago
fifty percent of the inhabitants
a fifty-percent decrease
hundred of example, hundred’ s of examplesthree foot
an eight-feet-long tail
ten thousands people
two millions years ago, two million year ago
fifty percents of the inhabitants
a fifty-percents decrease, a fifties-percent decrease
錯誤表達法
名詞：
hundreds of examples
形容詞：
three feet
an eight-foot-long tail
ten thousand people
two million years ago
fifty percent of the inhabitants
a fifty-percent decrease
hundred of example, hundred’ s of examplesthree foot
an eight-feet-long tail
ten thousands people
two millions years ago, two million year ago
fifty percents of the inhabitants
a fifty-percents decrease, a fifties-percent decrease