I have noticed that in some cases people write it is while in others it's. And in some cases you just cannot write it's.
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Is that your book over there? Maybe it is.
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It's a beautiful flower. Yes, it is, indeed.
In both these examples you can't write it's because it will sound strange. It may not only concern it is.
Is there a rule for this?
Best Answer
Source: End of sentence contractions.
Also, you might want to check the answers to a similar question posted on EL&U.
Grammar Girl has an interesting write-up on this topic. This paragraph seems particularly important.