Fewer and less are often used incorrectly. There’s a popular rule that teaches fewer is for countable nouns and less is for uncountable nouns. But this| LanguageTool
The correct plural form of sheep is sheep. Remember, “sheep” can function as a singular and plural form of the noun. Singular: We lost one sheep but| LanguageTool
“That” can function as a determiner, demonstrative and relative pronoun, adverb, and conjunction.| Blog