10 flagrant grammar mistakes that make you look stupid

1. Loose for lose
2. It's for its (or god forbid, its')   (I kinda sorta have trouble with this one)
3. They're for their for there
4. i.e. for e.g.
5. Effect for affect
6. You're for your
7. Different than for different from
8. Lay for lie
9. Then for than
10. Could of, would of for could have, would have

Details on how and why these make you look stupid

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