If you keep making the same grammar mistakes, stop treating grammar as one large subject. Repeated errors usually come from a smaller unstable pattern—tense, subject–verb agreement, articles, pronouns, prepositions, sentence boundaries, or another rule that is not yet reliable under real writing conditions.
Collect several examples of the same error, compare the incorrect and correct forms, explain what changes the choice, then practise the contrast in short sentences before returning to full writing. The aim is not to memorise another rule in isolation; it is to make the correct pattern available automatically when attention is also occupied by meaning and composition.
Use the English Learning Hub for grammar and writing routes. If the same mistake survives repeated correction, use the Diagnostics & Recovery Hub to isolate the deeper language gap.