Well I can't tell because you haven't written the question :P
yes it is
Yes.
No. It should be Neil Armstrong's footprint.
Well I can't tell because you haven't written the question :P
No. It isn't needed there.
The sentence "The cat chased its tail" needs an apostrophe added to be correct if intended to show possession, as in "The cat chased it's tail," which implies "it is." However, the correct form should actually be "its" without an apostrophe to indicate possession. Therefore, the sentence actually doesn't require an apostrophe for correct possessive use.
You don't have an apostrophe in your sentence. You don't need one either.
No, the apostrophe in "it's" is incorrect. The correct form is "its" without an apostrophe, as "its" is the possessive form of "it."
Yes if a possession and name of the person are in the same sentence
It is correct where you put it.
The correct sentence would be:This is Luke's book.If Luke ended in an s, the apostrophe would be after the s ; since it doesn't, an apostrophe and then an s must be added for possession.Example: Jesus' disciples, John's disciples....
Actually, when using a plural noun such as "books", there is no apostrophe. I hope that answers your question.