Gerunds
http://learnenglish.britishcouncil.org/en/english-grammar/verbs-ing-forms
Infinitives
http://learnenglish.britishcouncil.org/en/english-grammar/verbs/verbs-followed-infinitive
Should, can, etc.
http://learnenglish.britishcouncil.org/en/english-grammar/verbs/modal-verbs/ability-permission-requests-and-advice
Defining relative clauses
http://www.bbc.co.uk/apps/ifl/worldservice/quiznet/quizengine?ContentType=text/html;quiz=1238_defining_clause/
http://www.bbc.co.uk/apps/ifl/worldservice/quiznet/quizengine?ContentType=text/html;quiz=146_clauses
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