No, you do not need to use an apostrophe in "athletes" when referring to the plural form of the word. An apostrophe is only necessary to indicate possession (e.g., "the athletes' performance"). In general usage, simply writing "athletes" is correct.
'Athletes' is the plural of 'athlete'. However the apostrophe at the end (athletes') denotes possession also. Therefore it is a descriptive word. Put it in front of a noun to indicate that the noun belongs to a group of athletes.
' it's ' meaning ' it is'. e.g. 'It's over there' ; 'It is over there'. However, ' its ' is in the plural form and no apostrophe.
Put the apostrophe in mices right after s.: mices'
No apostrophe is to be putted in this sentence.
Personally, no. But it's not incorrect to put the apostrophe.
"Volkswagen" doesn't require an apostrophe.
no matter what you usually have to put a period after an apostrophe because it's the end of a sentence.
'Are not' becomes ' aren't '. 'Aren't ' becomes further Americanised corruption to 'aint'. These are not good These aren't good. These aint good. ( Not the double negative of 'These aint no good'. It's like saying 'These are not not good'.
won't (:
I'd
we'll
No.