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The daily freezing and melting of water causes large rocks to break up into smaller pieces.

I have faced a sentence and can't understand what is meaning of it. As far as I know after noun + and + noun we have to use verb for plural, but the sentence says different. Please help me. Thanks for your ideas.

marked as duplicate by Edwin Ashworth, Scott, Laurel, David, Davo Sep 7 '17 at 11:05

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It is the process of "daily freezing and melting" that requires the singular verb causes.

But if you would like to see the plural, perhaps

The freezing and melting of water cause large rocks to break up into smaller pieces.

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