12 English Grammar Rules You Absolutely Need to Know

1. It is perfectly acceptable to start a sentence with And or But

2. It is perfectly acceptable to end a sentence with a preposition.

3. The adverb corresponding to the adjective good is well.

4. The subject of the sentence determines the number of the verb.

5. Both either and neither, as subjects, take singular verbs.

6. With neither/nor and either/or in the subject position, the second element controls the number of the verb.

7. A flat adverb like thus or doubtless takes no –ly ending.

8. The words however, therefore, and otherwise cannot join independent clauses without additional punctuation.

9. With a verb phrase, the adverb usually goes after the first auxiliary verb.

10. Relative pronouns (that, which, and who) must appear alongside their antecedents.

11. An appositive is set off by commas when it is not essential to the sentence (when it is nonrestrictive), but is not set off by commas when it is essential (restrictive).

12. Correlative conjunctions (those used in pairs) require parallel phrasing.

Took cues from this HBR Ascend article : 12 English Grammar Rules You Absolutely Need to Know | HBR Ascend