The word sheep is one of a handful in the English language in which the singular and plural forms are exactly the same. Sheep in plural form is just sheep. You could say "I own a sheep" and you could say, "I own a flock (a group) of sheep". You use sheep interchangeably.
Examples:
I found a sheep in the road.
John has six sheep.
The dog corralled a flock of sheep.
One of my sheep got mixed in with my neighbor's sheep in his sheep pen.
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The noun 'sheep' is both the singular and the plural form.
Examples:
Mary had a little lamb that grew up to be a sheep.
When Mary grew up, she kept a flock of thirty sheep.
The noun 'sheep' is one of those words that is the same word for singular or plural.
Adding the apostrophe s ('s) to the end of the word forms the possessive, both singular and plural.
Examples:
One sheep's lamb was black. (singular possessive)
Two of the sheep's lambs were white. (plural possessive)