it'as
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
take a breath
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'.
none of the above.
Yes
Homicide, rape, treason, robbing, kidnapping, eluding the police, not using an apostraphe
Presidents is plural and possessive, so the apostrophe goes at the end: Presidents' Day.
No idea. But you seriously need to use spellcheck. 'Mothers' has and apostraphe before the 's'.
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'."
If you are using the word zoo in the plural form, or more than one, then it does not require an apostrophe. If you refer to something that belongs to the zoo, then, yes, it requires an apostraphe.
Yes you do; for example Harry's car or Mary'sfriend.
"I can't believe he did that." (shortened form of "cannot") "It's nice to see you." (shortened form of "it is") "She's going to the store." (shortened form of "she is") "Let's go for a walk." (shortened form of "let us")