If you are using a noun that cannot be counted or divided, such as "oil," "happiness," and "furniture," it is incorrect to modify that noun with "a," "each," "every," "either," or "neither."

Number Agreement

Instead of: Do you have a knowledge of Greek?

Consider: Do you have knowledge of Greek?

Instead of: The toddlers liked to move a furniture.

Consider: The toddlers liked to move furniture.

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