Capital letters and apostrophes (how to use them)

http://learnenglish.britishcouncil.org/en/grammar-reference/capital-letters-and-apostrophes

http://theoatmeal.com/comics/apostrophe

comparative and superlative adjectives

http://learnenglish.britishcouncil.org/en/english-grammar/adjectives/comparative-and-superlative-adjectives

http://www.eflnet.com/tutorials/adjcompsup.php

http://esl.fis.edu/grammar/rules/comp.htm

http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-snacks/comparative-and-superlative-adjectives

http://anthonyhalderman.com/english/compsup.htm