The first conditional
http://www.bbc.co.uk/worldservice/learningenglish/flatmates/episode24/languagepoint.shtml?postcard_dropdown=Episodes&x=7&y=11
The second conditional
www.bbc.co.uk/worldservice/learningenglish/radio/specials/1159_gramchallenge38/
The third conditional
www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv356.shtml
mixed conditionals
www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv344.shtml
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