托福独立写作对考生词汇运用方面的要求中，比较重要也是相当基础的一点就是不要用错词汇。然而这许多同学却总是会在词汇上摔个跟头。
1、托福独立写作词汇错误：主谓一致
我们来看以下句子：
Admittedly, books written on the basis of realities is valuable to most people.
A less complicated social environment is the most agreeable condition that help maintain the simplicity of children’s mental world.
第一句句子的主语是books，因此谓语动词应该用复数形式are而不是is，这就是“主谓一致”，即：谓语动词在单复数形式上要和主语保持一致。因此原句的正确表达为：Admittedly, books written on the basis of realities are valuable to most people.
第二句句子的主语是a less complicated social environment，谓语动词应该用单数形式helps. 因此原句的正确表达为：A less complicated social environment is the most agreeable condition that helps maintain the simplicity of children’s mental world.
2、托福独立写作词汇错误：谓语动词的表现形式
我们来看以下句子：
Most students like to watch TV cannot finish their homework in time.
Children who find passion in sports holding on to this passion throughout life, which leads to a healthier and more successful future.
第一句句子中like to watch TV和cannot finish their homework in time都是谓语动词，一般而言，两个谓语动词需要用连词(如and或but)进行连接，或者可以将like to watch TV变为从句，如：Most students who like to watch TV cannot finish their homework in time(定语从句).
第二句句子没有谓语。句子中who find passion in sports是修饰children的“定语从句”，which leads to a healthier and more successful future是以which为引导的“非限定性定语从句”。整句句子的谓语动词应该是hold，而不应该使用非谓语形式(holding)。在托福独立写作中尤其要注意there be句型中“谓语的表现形式”，如：
There are a great variety of articles and topics accurately reflect the diversity of users’ interest.
因为there be句型中的be本身就是谓语成分，所以不能使用reflect，而应改为：There are a great variety of articles and topics that accurately reflect the diversity of users’ interest(定语从句);或There are a great variety of articles and topics accurately reflecting the diversity of users’ interest(非谓语结构)。
3、托福独立写作词汇错误：谓语动词的语态
“语态”表现的是主语和谓语之间的关系，托福独立写作中主要使用“主动语态”，不建议频繁使用“被动语态”。
我们来看以下句子：
Many children can avoid their most disliked courses if they are given the opportunity to choose.
Because the content of an e-book is delivered electronically to their devices, students can shop for e-books and receive them almost immediately, any time of the day or night.
第一句句子中“避免最不喜欢的课程”动作的发出者是“孩子们”，因此是“主动语态”;而他们“被”提供机会进行选择是“被动”的。第二句句子中“电子书的内容”和“将电子版本传输到学生的设备之中”是“被动”的关系，而学生“购买电子图书”和“不管白天还是黑夜，可以第一时间收到这些图书”都是“主动”的关系。 |
