1. Verbs HAS to agree with their subjects.There are about 30 more but this one is my absolute favorite:
2. Prepositions are not words to end sentences with.
3. And don't start a sentence with a conjunction.
4. It is wrong to ever split an infinitive.
5. Avoid cliches like the plague. (They're old hat.)
29. Puns are for children, not groan readers.