【第一类】名词类

　　1. 这些女老师们在干什么?

　　[误] What are the womanteachers 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（单数）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。

　　【第二类】动词类

　　4. 你妹妹通常什么时候去上学?

　　[误] What time does your sister usually goes to school?

　　[正] What time does your sister usually go to school?

　　[析] 借助助动词do(或does)构成疑问句或否定句时，句中的谓语动词用其原形。