Have you lost something?
Is something missing? Can't you find it? We've all been in a situation where we've had to search for something we've lost. English has several useful words for this.
If you don't have something you need, it might be because you forgot to bring it.
• I forgot to bring an umbrella. I hope it doesn't rain!
You can shorten this to just "forgot".
• I forgot my swimming costume (US: bathing suit). I guess I won't go in the water.
However, you can't forget something in a particular place.
I forgot my briefcase at the office.
You have to say either:
• I forgot my briefcase.
• I left my briefcase at the office.
To put something in the wrong place is to mislay it.
• I seem to have mislaid my notes. Can you help me find them?
Something you can't find after some searching is lost.
• I seem to have lost my keys. I'm sure I left them in my jacket.
Things that aren't in their proper place have been misplaced.
• Maybe you've just misplaced them. They could be in that drawer.
Things that are lost sometimes turn up.
• Keep searching. I'm sure they'll turn up soon.
It's often worth checking at the lost and found.
• Have you called the lost and found?
However, some people don't return what they find. They believe the children's rhyme
• Finders keepers, losers weepers.