Reading the sentence shown in the sign below got me thinking about what part of speech, or lexical class, the word 'walking' is.
"In grammar, an adjective is a 'describing' word; the main syntactic role of which is to qualify a noun or noun phrase, giving more information about the object signified." So I thought 'walking' was an adjective.
But, "In grammar, an attributive verb is a verb which modifies (gives the attributes of) a noun as an attributive, rather than expressing an independent idea as a predicate." So, at second look, 'walking' seems an 'attributive verb'; therefore the word is a participle. Is it?
Or is the word a gerund?