The contraction for I would is I'd. I'd go see a doctor if I were you.
'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'.
Yes. Use an apostrophe S if you are indicating possession.
The contraction or "you would" is you'd. It is also the contraction for the phrase "you had." In either case, the apostrophe goes where the letters were removed.
With the word 'men' you would put the apostrophe between 'men' and 's'.
The hammer of neither doesn't require an apostrophe.
there is no apostrophe in the word cyclist.
Well if her name is "Agne" then the apostrophe would go here "Agne's ". However, if her name is "Agnes" then the apostrophe would go here "Agnes' "
yes
bells'
You put the apostrophe in children's between the n and the s. Children is plural for child. Since children is plural adding the apostrophe s makes it possessive.
If you mean as an abbreviation of 'old', then the apostrophe would be at the end of the word (ol'), because the apostrophe shows that the 'd' at the end of the word has been omitted.
' 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.