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，英语作文大全为大家整理了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!
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