OK, here are the rules for apostrophes:
Pluralizing (making a word mean 'more than one') add an 's' at the end. Writers.
Making it possessive for one person. Add 's at the end. Writer's.
Making it possessive for two or more people. Add an s' at the end. Writers'.
Example of all three: "David Smith was a writer. He was one of the many writers who believed in a writer's rights. For more than just one writer's rights, he believed that this right was one of the writers' creeds for all writers."
The correct way to write it is "Writers' Workshop" with the apostrophe before the s, which indicates that the workshop belongs to multiple writers. "Writers Workshop" without the apostrophe would imply that the workshop is for writers in general, not owned or associated with them.
No, the word "holidays" does not have an apostrophe.
there is no apostrophe
There is no contraction for the word apostrophe. It's is a contraction of it is or it has.
No, the word "skittles" does not have an apostrophe in a sentence. An apostrophe is typically used to show possession or contraction, which is not the case for the word "skittles."
No, the word "that" does not require an apostrophe to show possession. The possessive form of "that" is simply "that's."
The word o'er is an apostrophe of omission. It left out the v in over.
No, the word "sees" does not require an apostrophe. The apostrophe is used to show possession or omission of letters, not for pluralizing verbs.
Yes, won't has an apostrophe. It is a contraction for will not.
If the word ends in apostrophe s or ends in s apostrophe, then there is NO space before or after the apostrophe, but always a space before the next word.
An apostrophe (') is used at the point where letters are removed from a contraction. For example the word "can't" - the apostrophe is placed in the word to take the place of the second n and the o from the word "not," since "can't" is contraction of "cannot."
The apostrophe in "cyclist" would be placed before the last letter when indicating possession: cyclist's.