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You mean like "experts"? No, experts is plural, meaning it doesn't need an apostraphe. If you were saying something like: "That's the 'expert's' glasses" the word would be taking possesion, in that case, it would need and apostraphe. :D
it'as
No idea. But you seriously need to use spellcheck. 'Mothers' has and apostraphe before the 's'.
Yes you do; for example Harry's car or Mary'sfriend.
A contraction has an apostraphe to signify missing letters. Similar uses of apostraphe include words with letters missing at the end, which are usially alsng, such as nothin' or ol'.
Yes
none of the above.
There is no space. If you mean a word such as "isn't" there is no space between the apostraphe and the final letter in the word.For words or names that require an apostraphe at the end of it, such as "Mr Jones'" the need for a space is only required if the word is a part of the sentance and not the end such as "It belonged to Mr Jones' cat." or "It was Mr Jones'."
Presidents is plural and possessive, so the apostrophe goes at the end: Presidents' Day.
Homicide, rape, treason, robbing, kidnapping, eluding the police, not using an apostraphe
If a name ends in S and is singular, add an apostrophe and another S ('s) to indicate possession (e.g., James's book). If the name is plural, just add an apostrophe (e.g., the Jones' house).