Hello fari, The 'grammar' in English or any other language is one of the essential components of the language . If you have learned loads of vocabulary but you are weak in grammar you won't be able to link them together in comprehensible sentences ,so there would be no context or sense for the sentence or it could be totally misunderstood .So grammar basically links the vocabulary in correct comprehensible sentences and is so important to any language !:)

it is very important!!hey wait maybe *grammar*if you want to be fluent in english first you should learn right grammar. it's the proper use of words and sentence.