“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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“You've just got to force yourself to sit down and concentrate.”

Your son is getting bad grades in school and you want him to study harder. He complains that he can't focus on his homework and wants to know how he can become more focused. You don't think there's any special method except just trying harder. You say:

You've just got to force yourself to sit down and concentrate.

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