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The few grammar rules that make the biggest difference to how correct you sound — subject-verb agreement, articles, and sentence order.
You don't need to know every grammar rule to speak well. Get these few right and you'll instantly sound more correct.
1. SUBJECT–VERB AGREEMENT
The verb must match the subject.
• He/She/It → adds -s: "She plays.", "He goes."
• I/You/We/They → no -s: "They play.", "We go."
✗ "She go to school." → ✓ "She goes to school."
2. ARTICLES: a / an / the
• "a" before a consonant sound: a book, a university.
• "an" before a vowel sound: an apple, an hour.
• "the" for something specific: "the book on the table."
✗ "I am student." → ✓ "I am a student."
3. WORD ORDER: Subject + Verb + Object
English follows S-V-O. "I (S) eat (V) rice (O)."
✗ "Rice I am eating" → ✓ "I am eating rice."
4. PREPOSITIONS (small words, big impact)
• in (months, years, cities): in June, in Delhi
• on (days, dates): on Monday
• at (time, exact place): at 5 pm, at the door
5. QUESTIONS
Use a helping verb: "Do you like tea?", "Where is she going?"
✗ "You like tea?" → ✓ "Do you like tea?"
Don't aim for perfect — aim for clear. Fix one rule at a time and use it in real sentences today.