“Stand clear of the closing doors please.”

You're getting into a subway car. The doors are going to close in a minute, so the train driver announces:

Stand clear of the closing doors please.

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“Don't try to force it in!”

You're going on a trip with your friend. He's trying to get your suitcase into the trunk of his car, but there isn't enough room. He's pushing on it hard to try to fit it in, but you're afraid he'll break something. You say:

Don't try to force it in!

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