Yes, warned is a verb.
A verb is a word that describes an action (run, walk, etc), a state of being (exist, stand, etc) or occurrence (happen, become, etc).
Yes, warned is the past tense of the verb to warn.
No, it is a verb. Warned is the past tense and past participle of the verb to warn. It might be used as an adjective.
The word warned is a verb. It is the past tense of the verb warn.
The word warned is a verb. It is the past tense of the verb warn.
The verb is "warned." It's the past tense of "to warn." But be advised that some signs do not have verbs at all: they just have fragments like "no passing" or "school zone." And as others on this page have noted, "falling" can be a verb, but in the sentence you asked about, it is not--it's an adjective that describes "rocks."
The direct object in this sentence is "us." The verb "warned" is directly affecting "us" by giving them a warning to stay on the ranch.
Warned has no prefixes or suffixes.
* "I was worried about you; you could have warned me you would be late."* "Inasmuch as you were at the supermarket, you could have bought some milk."* "You could have passed the test if you had studied more."
As it's written, no, it is not. It lacks a subject. The only possible subjects that correspond to the verb is I, we, you,and they. The example is one pronoun short of being a sentence.
The word warn is not a noun, it's a verb (warn, warns, warning, warned). The noun form, warning, is a verbal noun (gerund) which is a common noun.
Be Warned was created in 2002.
Warned is the correct spelling.