How to learn the English grammer better?Is it very important?

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learning grammar is important 
i learnt a lot from these books

Practical English Usage   by Michael Swan
English Grammar in Use  by Raymond Murphy 
Advanced Grammar in Use   by Martin Hewings

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learning english grammar online :- 

www.ego4u.com/ 
www.nonstopenglish.com/ 
www.english4today.com/

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Learning English without learning grammar is like doing math without learning addition or subtraction. It just does not make sense.

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I think the language intuition is more improtant than grammar.

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能说中文太好了。标题我觉得应该是well，不是better。还有语法拼错了，是grammar。
说不重要也重要，说重要也没那么重要。
至少要先知道一些基础，不然会误解或者根本不明白句子的意思。
然后通过不断的阅读等等，了解高级语法。