The most annoying grammatical error I see in Internet writing is people using the word "loose" when they mean to use the word "lose". This post shows the difference between lose and loose.
Lose is a verb. Some examples include the following:
- Lose a game
- Lose weight
- Lose your keys
Loose is an adjective. Some examples include the following:
- A loose tooth
- Loose-fitting pants
- A loose (promiscuous) woman