Anon, did you even read the thread before you posted? 

Mister Micawber

“
Here you go (courtesy of Bedford/St. Martin's):

'A metaphor is a figure of speech that makes a comparison between two unlike things, without using the word "like" or "as." Metaphors assert the identity of dissimilar things, as when Macbeth asserts that life is a "brief candle." Metaphors can be subtle and powerful, and can transform people, places, objects, and ideas into whatever the writer imagines them to be. An implied metaphor is a more subtle comparison; the terms being compared are not so specifically explained. For example, to describe a stubborn man unwilling to leave, one could say that he was "a mule standing his ground." This is a fairly explicit metaphor; the man is being compared to a mule. But to say that the man "brayed his refusal to leave" is to create an implied metaphor, because the subject (the man) is never overtly identified as a mule. Braying is associated with the mule, a notoriously stubborn creature, and so the comparison between the stubborn man and the mule is sustained. Implied metaphors can slip by inattentive readers who are not sensitive to such carefully chosen, highly concentrated language. An extended metaphor is a sustained comparison in which part or all of a work consists of a series of related metaphors. Robert Francis' poem "Catch" relies on an extended metaphor that compares poetry to playing catch. A controlling metaphor runs through an entire work and determines the form or nature of that work.'

”

Anonymous

“a metaphor has a linking verb in it example, the kid,was very excited to go home.

”

Actually, 

I don't think you have an understanding a what a metaphor is at all.