一、可數(shù)名詞是可以用來(lái)計(jì)數(shù)的名詞.可數(shù)名詞有單數(shù)和復(fù)數(shù)形式.如：desk-desks,apple-apples等.不可數(shù)名詞是不可以直接用來(lái)計(jì)數(shù)的名詞.不可數(shù)名詞沒(méi)有復(fù)數(shù)形式,只有單數(shù)形式.如：some bread,a little milk等.
二、單數(shù)可數(shù)名詞表示泛指時(shí),前面要用不定冠詞a(an),表示特指時(shí),前面要用定冠詞the; 而不可數(shù)名詞前不能用a(an)修飾,表示特指時(shí),前面一定要用定冠詞the.如：
He is a factory worker.他是一名工人.
No one can see air.沒(méi)有人能看見(jiàn)空氣.
三、可數(shù)名詞和不可數(shù)名詞前都可以用some,any,a lot of,lots of 等來(lái)修飾,表示"一些,許多".如：
There are some oranges on the desk.桌子上有一些桔子.
There is a lot of water in the bottle.瓶里有許多水.
四、可數(shù)名詞前可用具體的數(shù)詞來(lái)表示具體的數(shù)量.如：two apples,four books等.不可數(shù)名詞前通常用"單位詞+of"來(lái)表示數(shù)量.如：a piece of paper,three pieces of paper等.
五、可數(shù)名詞作主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞的單復(fù)數(shù)與主語(yǔ)的單復(fù)數(shù)保持一致.如：
This picture is very beautiful.這幅畫(huà)很美.
不可數(shù)名詞作主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞要用單數(shù)形式,但是不可數(shù)名詞前有復(fù)數(shù)"單位詞"時(shí),謂語(yǔ)動(dòng)詞要用復(fù)數(shù)形式.如：
There are two cups of tea on the table.桌上有兩杯茶.
六、對(duì)可數(shù)名詞前的修飾語(yǔ)提問(wèn)用how many; 對(duì)不可數(shù)名詞前的修飾語(yǔ)提問(wèn)用how much.如：
How many apples are there in the box?盒子里有多少個(gè)蘋(píng)果?
How much tea is there in the cup?杯里有多少茶水?
注意：對(duì)不可數(shù)名詞前的"單位詞"的修飾語(yǔ)提問(wèn)時(shí),疑問(wèn)詞用how many.如：
How many pieces of bread are there on the plate?盤(pán)子里有多少片面包?