Identify the error: Each boys received a prize.

The error in the sentence "Each boys received a prize" is in the word "boys". This mistake relates to the correct usage of the distributive determiner "each."

• The word "each" is used to refer to every single item or person in a group individually. It emphasizes the singularity of the members within a collective.
• When "each" is used directly before a noun, that noun must be in its singular form. For example, "each student," "each book," "each car."
• In the given sentence, "boys" is a plural noun. However, "each" requires a singular noun to follow it.
• Therefore, "boys" is incorrect and should be replaced with the singular form "boy."
• The correct sentence should be "Each boy received a prize."
• If one wanted to use a plural noun after "each," the construction would typically be "each of the boys," but in this direct usage, a singular noun is mandatory.

Understanding the singular requirement of nouns following "each" is fundamental for grammatical accuracy.