The Technical Stuff
Grammar is stored in your procedural memory. That's a fancy way of saying the stuff you do without thinking.
When you ride a bike, that's procedural memory in action. Swimming. Typing. Breathing. You get the idea.

When you learn by memorizing rules and filling in blanks, that's like trying to learn to ride a bicycle by reading the manual.
It just doesn't work.

Understand something, then do it. In your own works. The next time you're in the situation, speaking will happen without thinking. Your brain knows where to find what it needs without thought.
It just works.

TRY IT NOW