Practicing English every day is a little like taking that same ride every day. You will be able to use the grammar rule without thinking about it. Most native speakers rarely remember the grammar rules. If you ask a native speaker about a grammar point, they may say, "I can't tell you why. I just know it sounds right or it sounds wrong." When you read or listen to English every day, you will train your brain to apply the rules so that the structure of the language will sound right to you. Of course you have to learn the grammar rules first, but with lots of practice, it will be easier to remember how to use them.