A signed warned drivers about falling rocks along the street.

in this sentence would the only verb be warned because falling is an adj describing rocks

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In the sentence you provided, "warned" is indeed the main verb. It is an action verb that describes what someone or something did. However, "falling" is not an adjective but rather a present participle verb form that is functioning as an adjective phrase. It modifies the noun "rocks" by telling us more about the type of rocks – specifically, that they are falling rocks.

To identify the main verb in a sentence, you can ask yourself what action is taking place or what the subject is doing. In this case, the subject (a sign) is doing the action of warning, so "warned" is the main verb.

To identify the adjectives in the sentence, you can ask yourself what words are describing or providing more information about the nouns. In this sentence, "falling" describes the type of rocks, so it functions as an adjective phrase.

So, to recap, the main verb is "warned" and the adjective phrase is "falling rocks."