An adverb.
The word tell is a verb. It means to narrate something such as a tale.
adjective
preposition
Adjective, It tells when.
As a verb it would be "He lies when he tells the story." As a noun "He tells lies when he talks."
An active verb is required; any other part of speech may be present.
An adverb, an adverb of frequency, because it tells how often you did the verb.
It is a possessive noun. It tells us the plan belongs to God
The word "ending" can function as a noun or an adjective, depending on the context.
Yes. A dictionary tells you the part of speech (e.g. adjective) of each word before giving the definition.
Easily is an adverb. It tells how the Cowboys defeated the Lions.
It is an adverb because it tells when the verb occured.