A measure word must be inserted between the numeral and the noun and each noun has its own measure word. One must use the specific measure word.

• 这学期我们要学完三书。正:这学期我们要学完三本书。汉语中,数词和名词间必须有量词,而且,每个名词都有自己特定的量词,不能随便乱用。