An apostrophe is used when you want the word to mean "Belongs to".
Examples: "I have two Freds in my family." These Freds are not being used in the sentence in the sense that they belong to anyone, so no apostrophe is used.
"Yesterday was Fred's birthday." The birthday is something that belongs to Fred, so an apostrophe is used.
An apostrophe is alos used if the word is a contraction. That is when a word is shortened. Examples: 'Do not' is shortened to don't. 'Will not' is shortened to won't.
'You are' is shortened to you're. 'It wil'l is shortened to it'll, 'Shall not' is shortened to sha'nt, and so on.
"It's" is a contraction that stands for "it is" or "it has," and it includes an apostrophe to replace the missing letter (i).
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'.
Yes
none of the above.
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
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.