1. 这些女老师们在干什么？
[误] What are the woman teachers doing？
[正] What are the women teachers doing？
[析] 在英语中，当一名词作定语修饰另一名词（单或复数形式）时，作定语的名词一般要用其单数形式；但当man，woman作定语修饰可数名词复数形式时，要用其复数形式men，women.
2. 房间里有多少人？
[误] How many peoples are there in the room？
[正] How many people are there in the room？
[析] people作"人、人们"解时，是个集合名词，其单复数同形。
3. 我想为我儿子买两瓶牛奶。
[误] I want to buy two bottle of milk for my son.
[正] I want to buy two bottles of milk for my son.
[析] 表示不可数名词的数量时，常用"a / an或数词 +表量的可数名词 + of + 不可数名词"这一结构， 其中当数词大于1时，表量的可数名词要用其复数形式。