No. Apostrophes are rarely used to make nouns plural. "Remember to dot your i's and cross your t's" is one of the rare instances that apostrophes are use to pluralize something.
As a plural, for more than one dad; no, does not need an apostrophe. As a possessive, as in the item belonging to dad, then yes, it does need an apostrophe.
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If you're talking about more than one employee, then don't use an apostrophe. Plural words should never have an apostrophe. If you're talking about something that belongs to a single employee (such as "the employee's computer") then you need an apostrophe.
I am does not need an apostrophe. It is only when you make it into a contraction by dropping the a that you need the apostrophe. It becomes I'm in that situation.
No, Korean language does not use apostrophes in its writing system.
No. The Cannons doesn't need an apostrophe.
No, Christmas Eve does not need an apostrophe.
No, because plurals do not need an apostrophe.
No, there shouldn't be an apostrophe in "horses" as it is a plural noun. The sentence is correct as "the horses stalls are clean."
No. Harringtons doesn't need an apostrophe.
The plural "Thursdays" doesn't need an apostrophe.
"Infants" does not have an apostrophe because it is a plural noun that does not require possession or contraction. If you wanted to show possession, you could use "infants'" (infants' blankets) or if you wanted to create a contraction, it would be "infant's" (infant's diaper).