English grammar: Conditional

mason00

http://www.englishpage.com/conditional/conditionalintro.html

Present Conditionals

Present Real Conditional
FORM
[If / When ... Simple Present ..., ... Simple Present ...]
[... Simple Present ... if / when ... Simple Present ...]

Present Unreal Conditional
FORM
[If ... Simple Past ..., ... would + verb ...]
[... would + verb ... if ... Simple Past ...]

Past Conditionals

Past Real Conditional
FORM
[If / When ... Simple Past ..., ... Simple Past ...]
[... Simple Past... if / when ... Simple Past ...]

Past Unreal Conditional
FORM
[If ... Past Perfect ..., ... would have + past participle ... ]
[... would have + past participle ... if ... Past Perfect ...]

Future Conditionals

Future Real Conditional
FORM
[If / When ... Simple Present ..., ... Simple Future ...]
[... Simple Future ... if / when ... Simple Present ...]

Future Unreal Conditional
FORM 1 (Most Common Form)
[If ... Simple Past ..., ... would + verb ...]
[... would + verb ... if ... Simple Past ...]

FORM 2
[If ... were + present participle ..., ... would be + present participle ...]
[... would be + present participle ... if ... were + present participle ...]

FORM 3
[If ... were going to + verb ..., ... would be + present participle ...]
[... would be + present participle ... if ... were going to + verb ...]

[ 本帖最后由 mason00 于 8-11-2011 16:42 编辑 ]

mason00

That website is a good resource to learn English grammar. It is interesting to see that the present unreal conditional shares the same form with future unreal conditional form 1. I saw other classifications, but this is the clearest one I think. It also provides detailed sentence samples and usage guide.

[ 本帖最后由 mason00 于 8-11-2011 17:50 编辑 ]