Never. As apostrophes represent ownership or a contraction I do not believe sees has an apostrophe.
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The plural form of "apostrophe" is "apostrophes."
A plural apostrophe doesn't look like anything. There's no such thing as a plural apostrophe.
Yes, the plural form of apostrophe is "apostrophes".
If the plural noun has possession, indicate it by using an apostrophe after the S.
The plural is rulers [no apostrophe].
The plural is summers. (no apostrophe!)
The plural is fathers (no apostrophe).
The plural of governor is governors (no apostrophe necessary). The plural possessive form of governor is governors'.
"Companies" is the plural "company" and doesn't require an apostrophe unless you are using a plural possessive. With the plural possessive, the apostrophe should appear at the end of the word after the 's'.
Veterans - plural does not have an apostrophe.Veteran's - singular possessive does have an apostrophe.Veterans' - plural possessive does have an apostrophe.
The plural "Thursdays" doesn't need an apostrophe.