句子的核心是谓语动词，谓语动词的确定取决于主语。根据句子含义和结构认准主语是掌握主谓一致的必要条件；弄清主谓一致的语言规则和习惯是掌握主谓一致的充分条件，要正确使用主谓一致，两个条件缺一不可，但同学们往往会走入以下三大误区。 误区一 误认主语 1. 倒装句 ①Between the two buildings are a big tree. (×） ②Between the two buildings is a big tree. (√) [解析] 第①句谓语动词使用are，错误地认为the two buildings是该句的主语，但实际上是介词between的宾语，一起构成介词短语，而介词短语不能充当主语。该句是一个倒装句，真正主语是a big tree.因此第②句正确。 特别提醒 倒装句的常见结构：副词/介词短语 谓语 主语 2. 主语之后带有介词短语 ①The fruit like apples, oranges are good for our health. (×） ②The fruit like apples, oranges is good for our health. (√) [解析] 第①句误认为apples, oranges是主语，因此谓语动词用are，而实际上the fruit才是该句的主语，like apples，oranges是介词短语作后置定语修饰the fruit.该句译为“像苹果、桔子之类的水果对我们的身体是有好处的”。因此第②句是正确的。 特别提醒 类似的结构有：主语 with / like / except / but / together with / as well as . . . ，谓语动词应与主语一致，而与介词短语之后的名词无关。 3. one of . . . 名词复数或复数代词 ①There are twenty boys in our class. One of the boys are from Canada. (×） ②There are twenty boys in our class. One of the boys is from Canada. (√) [解析] one of the boys的中心词是one，因此谓语动词用单数，造成第①句错误的原因主要是把the boys当成了该句的主语。 4. 定语从句 ①I like the photos which was taken in Beijing. (×） ②I like the photos which were taken in Beijing. (√) [解析] which were taken in Beijing是一个定语从句，用于修饰先行词the photos，而which本身就代替先行词the photos.因此谓语动词要用复数，造成第①句错误的原因是没有弄清楚关系词which的实质，只是从形式上看它是单数。 特别提醒 定语从句中的谓语动词应该与先行词保持一致。