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To use the language by speaking is the best way to practice the grammar
The best way to get around English Grammar or any language's Grammar is to practice the language itself and Grammar will come along, except for debatable matters and situations that are strict to a rule. However, try reading, A LOT; reading is the most important tool. You can also watch movies without subtitles or only look at the subtitles when you feel in need. You can also go through Grammar teaching websites and take exercises on regular basis to keep your memory refreshed so you would never feel short on your knowledge of a certain rule.
Hope this was helpful, good luck!