Measure words
When Chinese expresses quantity, a measure word is normally used after the number. For example:
口kǒumeasure word for people
个gèthe general measure word
Basic structure
Number + measure word + (noun)
四口
四sìfour
口kǒumeasure word for people
人 is not said here, but people are what is meant.
四口人
四sìfour
口kǒumeasure word for people
人rénperson
两个
两liǎngtwo
个gèthe general measure word
The noun is not said here.
两个学生
两liǎngtwo
个gèthe general measure word
学生xuéshengstudent