Posted by John on Saturday, June 14, 2008 at 5:48am.
All the sentences are grammatical, even that last one if it's considered exclamatory!
In that last sentence, "back" is being used as an adverb, to tell WHERE they are going. In this sentence, the subject and verb have been omitted, probably considered to be understood. Perhaps the entire sentence would read, "Now, let's go back to the Weather Station, Shelly." The words "let's go" (understood) include the subject "us" in the contraction "let's" and the verb "let...go." It's very idiomatic, and is much more easily understood than explainable!!
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