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Ex. The Gift basket carries mangoes, bananas, pineapples, and a watermelon.
Or, it should be
Ex.The Gift basket carries mangoes, bananas, pineapples, and watermelons
Can I use both singular and plural nouns when adding things to a list?
Both your example sentences are correct. But it depends on the exact situation.If there exists a case where there are more than one melon, then you should use 'watermelons' else just go with 'a watermelon'
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