This is the classic "input vs. output" problem. You have consumed English through textbooks, but you have never learned the formula to produce it spontaneously.
Unlike the thick grammar books he hated, this PDF was just ten pages long. It didn't focus on tenses or prepositions. Instead, it introduced : english samsarikkan oru formula free free pdf
If you cannot access the full PDF immediately, several free digital resources offer similar "formulas" for fluency: This is the classic "input vs