所以到底应该如何有效地学习语法哪？就托福写作的应试来说，独立写作部分要求在30分钟内完成一篇至少300个字的议论文，所需要的语法点并不是特别多。我们应当首先掌握几个常见的语法点，并保证能把它们应用上。
1
分词做状语
（包括现在分词和过去分词做状语）
这个语法可以用来替代状语从句，表时间，原因，条件，让步等，丰富作文的句式。需要注意的是状语部分的逻辑主语和主句的主语要保持一致。
Living in such a society with more repetitive work to undertake and more ubiquitous pressure to put up with, people now have to find themselves leisure time activities so different from their work.
Driven by profit, advertisement companies often provide exaggerating or even false information.
还有一些分词做状语已经成为固定的用法：
Put frankly 坦白说
Given（that）…., 假设，考虑到
2
非性定语从句
在句中起补充说明的成分，让语法结构更复杂。
Not only can such activities foster his characters 【部分倒装】, but he can also discover the unknown of life, which is crucial to an individual who is eager to know the world at a young age.
3
虚拟语气的倒装
经常用来总结例子，多使用对过去事实的虚拟。
结构为：
Had 主语 been/done….
主语 should/could/might/would have done….
Had my coach not asked me to lead the team, I would have not made these friends.
4
被动语态
简单的语法却可以让行文显得更正式：
The quality of education has been greatly improved.
一些固定的用法也很好用：
It is commonly acknowledged that …..众所周知
It is widely believed that….大家都相信

5
强调句型
可以更清晰地传达出写文章的人的立场和感情
比如it is 的强调句型：It is/was 被强调的成分 that/who, 所强调的可以是单词、短语，也可以是从句，但必须保证其结构完整。被强调的成分可以是主语、表语、宾语、同位语、状语等，但不能是定语或谓语。
Older people usually have heavy responsibilities on their shoulders, and it is these responsibilities that
render them incapable.
还可以利用do/does来强调
Employing more teachers does have certain benefits in enhancing students’ academic performance.
学习语法规则是写作基本的一个要求。认认真真看书做练习，记住规则并不是多难的事情。同时我们也要去理解规则的含义，在范文中如果遇到了不常见的用法，不要放过，要仔细查证。而写作的过程也是一个应用语法的过程。所以大家要勤练多写，攻克语法关指日可待。