Juxtapose means to put side by side, so... Juxtapose the T-shirts for a better comparison. ...is an example of its use. It's a bitter easier to use in its other forms like 'juxtaposition'.
Juxtapose means to place two things side by side to compare and contrast them. A sentence would be something like: "Juxtaposing the two essays revealed the huge differences in the author's...
When it has a subject, verb, punctuation, capitalization, a predicate, and a complete thought. A sentence is a sentence when it is handed down by a judge (or a magistrate).
A sentence is a sentence because it has a subject (noun or noun phrase), a predicate ( verb) and punctuation as well as the other parts of speech like pronouns ( she, it him, her, they, them)...