Level B1
Loose vs Lose
Loose and lose look alike. Lose is an action: we can't find something (Don't lose your keys!). Loose describes a thing that is not tight (This shirt is too loose).
Don't lose your keys!
Look: Don't lose your keys! Lose is an action.
Forms
I often lose my pen.— lose: an action, we can't find itThis shirt is too loose.— loose: describes a thing, not tightWe don't want to lose the game.— after to: lose
A common mistake
Wrong: Don't loose your keys!
Right: Don't lose your keys!
A common mistake is to write loose here. We say: Don't lose your keys!
More examples
My tooth is loose.
Loose can describe a tooth too: My tooth is loose.
Did you lose your phone?
Lose comes in questions as well: Did you lose your phone?