Does a metaphor use as?
No, a metaphor is a comparison not using like or as. A simile is a comparison that does use like or as.
a metaphor doesn't use any specific words, But a metaphor can not use the words "like" or "as". If "like" or "as" is used, it's a simile. A Metaphor is "something used to represent something else" or "A comparison between two things, without using like or as". For example: "life is a journey" - This is a metaphor because it is comparing Life to a Journey, and does NOT use like or as.
An extended metaphor is a metaphor that is started early in the work, usually at the beginning, but it can be added later, that evolves and stretches itself throughout the passage. For example if you were to write a paper, and use a road as a metaphor for the path of life, and you were to develop and use this metaphor throughout the paper then it would be an extended metaphor.
In simile, you use the words like, as. For example: "She is cute as a puppy." In metaphor, it does not use the words like, as. For example: "He is a pig." So to transform a simile to a metaphor, you should not use the words, like, as in the sentence. For example: Simile- I eat like a pig. Metaphor - I am a pig. Hope this helps.