Grammar is the backbone of any language. If it is not your mother tongue. Since all we know we have not learn any grammar rules and regulation to speak our mother tongue. Since childhood we listen and speak. If you want to learn any other language then your mother tongue the big answer is “Yes” you should have answer of grammar and that should be fitted on your tongue. It is very important that you should have knowledge of present, past, future. Very simple Example like in Hindi
Means it is very much clear now that anytime “am, is, are” in present tense “was, were” in past tense and “shall be, will be” in Future tense – as above tense change with, am, was and shall be change the meaning of ceQ KegMe ntB / Lee / jntBiee… so your tongue should be fit with all helping verb / Auxiliary verb, if your tongue has tune with all helping verbs means you will be more efficient speaker of English Language.
Now it is completely on you that how to do proper practice of mouth translation of your mother tongue like – Hindi, Gujarati, Marathi, Telugu, Tamil, Bengali, Oriya, Punjabi, Bhojpuri, Maithili etc. and all our 22 Constitutional language or our Indian language or International language Like French, Germany, Japanese etc. or any other than English, means your tongue should be twisted with am, is, are, was, were, shall be, will be has, have, had, shall have, will have so on, and you can become fluent speaker of English language.