What's the difference between tend to do, have a tendency to
A continuing problem at the time was the film had a tendency to break when they were being played
A continuing problem at the time was the film tend to break when they were being played

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Definitely 'tend to', is more commonly used.

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They have the same meaning but are grammatically different. 'Tend' being a verb and 'Tendancy' being a noun.

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Either is fine in conversation!

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