The following is from CGEL. Can you please explain what they mean by "its value as a diagnostic is quite limited"?
Predicative adjectives most often occur as complement to the verb be, but be allows such a wide range of complements that its value as a diagnostic is quite limited. Much more useful from this point of view are the verbs become and make, and to a lesser extent seem, appear, feel, look, sound, which take a more restricted range of complements.
Tara2 its value as a diagnostic is quite limited The fact that a word follows the verb "be" (or some inflection thereof) is not very useful for determining the part of speech of that word.
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Tara2its value as a diagnostic is quite limited
The fact that a word follows the verb "be" (or some inflection thereof) is not very useful for determining the part of speech of that word.