备考托福写作一定要打好语法基础，如果写作中出现太过明显的语法错误肯定会影响写作成绩。下面，小站君为大家整理了 6 类托福写作中常见的语法错误，希望大家在写作中能够避免。
1. 托福写作常见语法错误之句子缺少连词
两个句子之间不能只用逗号连接，要有连词。
误：My sister loves to dance， she is very good at it.
2. 托福写作常见语法错误之句式不平行
句子中并列的成分应该是相同的结构。
误：I like to eat Japanese and eating Thai food. ( eating-> eat )
误：Teenagers are more influenced by their peers than their parents. ( than their parents-> than by their parents )
3. 托福写作常见语法错误之句子不完整
句子缺少主语或谓语。
误：Because some necessary procedures such as transporting the factories， modifying equipment or planting more trees.
4. 托福写作常见语法错误之句意重复或冗余
误：The low-priced car was inexpensive. ( low-priced 和 inexpensive 重复 )
误：Personally， I believe what the newspaper prints. ( personally 和 I believe 重复 )
5. 托福写作常见语法错误之时态，语态不一致
我们来看几种常见错误 ( 句例说明 ) ：
She did not adapt to the environment, but with time passing by, they find him more and more proficient.
she 和 him 是怎么个意思咧
I shall use my father's experience as an example. My father went to Australia several years ago. He see many birds and animals. 明明是过去，see 怎么穿越回来了
The gift I made are very pretty. gift 是单数啊，are 是怎么回事

6.托福写作常见语法错误之连词类缺失
Successful men will have many places to live, a country house can provide a nice environment to relax, then it will be a new start point, but will not be an end one.
大家暂且忽略语法问题，且看这个句子。这个句子的第一个问题就是连词缺失：在 live 和 a country house 之间原作者使用逗号衔接的，但是呢，逗号并不能代替 and 等连词的作用。因为 Successful men will have many places to live 和 a country house can provide a nice environment to relax 都是两个完整的句子，而没有主从依附关系，所以必须得有连词 ( and，but，therefore ) 等连接才能保证句子有效。
总结：缺连词的另一大原因是很多同学不知道什么是连词，什么不是。and or but 是最有名的三个连词。但是 !however, so, yet, nevertheless 也是连词 !!! 可以连接两句句子 !
以上是小编为大家整理的托福写作中常见的语法错误，希望对大家备考有帮助。托福写作考试中建议大家留出 2-3 分钟检查，主要检查和修改文章中的语法错误。