What does remain of shell means?
Usually a "shell" of a person, means that he or she is no longer the way they once were. This could be due to life circumstances like having a hard life, living on the street, or dieting a lot.
it doesnt mean anything without knowing the context ..
remain means what is left from whatever it is, in this case, a shell. It was once a whole shell, an unbroken shell, but apparently some of it has broken off and disappeared, so all that you have is what remains, the remain of a shell or the remains of a shell. You can say either depending on the circumstance. Strictly speaking, a remain is a single piece only, and usually we would say remains of, even if there is just the one piece. Sometimes, though, sentence structure and subject verb antecedent relationships could impose the singular remain.
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