Yes, if it means a possession of 1940.
Example: 1940's music
Yes if its is used as the contracted word of it is, it should be written as it's.
it's is a abbreviation of it is so it should have an apostrophe
no There should never be an apostrophe in "never".
20s is correct.
It should not have an apostrophe.
The sign for an apostrophe is '. It is used to indicate possession or contraction in written language.
Will not is not written as willn't, but is written as won't.
No. Harringtons doesn't need an apostrophe.
Yes, the sentence should have an apostrophe to denote possession. It should be written as: "Linda and her vice presidents' are going to Brazil."
No, "this years" does not have an apostrophe. It should be written as "this year's" if you intend to show possession.
Should not = shouldn't
If photos means more than one photo, then there is no apostrophe. "Of the photo" is written as photo's. "Of the photos" is written as photos'.