1. Your vs. You’re.  One means ‘you are.’ It’s easy to get started on writing and be so caught up in it that you just skip over this common mistake.
2. They’re vs. Their. One is they are and the other is possessive. Another easy mistake.
3. Its vs. It’s. It’s is just ‘it is.’ Its is actually the possessive form.
4. Affect vs. Effect. Effect is a noun. Affect is verb.
5. Me vs I. If you can take out the other person’s name in the sentence and it still makes sense, then it is probably correct. “Ally and I like peas.” and “Can you give Ally and me the address?”
6. Then vs. Than. Then is used for time. Than is for comparison.
7. Less vs. Fewer. Use fewer for things you can count, and less for things you can’t.
8. Farther vs. Further. Farther is used more to talk about physical distances, while further is used to speak about figurative distances.
9. Who vs. Whom. We all dread this one. Who can only be the subject of a verb. Whom will never be the subject of a verb, and is always used after prepositions.

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