It depends on what words come after and how you're using it in the sentence.
Example:
My ancestors came from Italy.
My ancestors' curly hair is beautiful.
If it is possessive (owning something), use the apostrophe. If not, don't use one.
No, Korean language does not use apostrophes in its writing system.
No, "Doc Adams" does not need an apostrophe unless it is possessive, such as "Doc Adams's bag."
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, the word "says" does not need an apostrophe. It is the third person singular form of the verb "to say."
No, the plural form of "day" is "days" and does not require an apostrophe. An apostrophe is used to show possession or contraction, not to form plurals.
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. The Cannons doesn't need an apostrophe.
No, Christmas Eve does not need an apostrophe.
No, because plurals do not need an apostrophe.
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.
No. Harringtons doesn't need an apostrophe.
The plural "Thursdays" doesn't need an apostrophe.
No, Korean language does not use apostrophes in its writing system.
No, "Doc Adams" does not need an apostrophe unless it is possessive, such as "Doc Adams's bag."
Lost wages doesn't 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, ours does not need an apostrophe (ever).The piano at the church had been ours.