If it is determined that there is a zero on the end of " deer " in " three deer ", it is uncertain whether English adjectives agree with the number of the noun they modify, using the same zero affix . ( Deictics do so : compare " this deer, these deer " . ) In some theories of syntax it is useful to have an overt marker on a singular noun in a sentence such as " My head hurts " because the syntactic mechanism needs something explicit to generate the singular suffix on the verb.
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