Websters seem to go for 3 simple, 3 perfect and 6 progressive variations.

When I did Latin we spent ages on "pluperfect" for example "I wish I were king" - I'm not sure where that fits in. As for subjunctives - that's all lost in haze!

SIMPLE TENSES
Present
Past
Future

PERFECT TENSES
Present perfect
Past perfect
Future perfect

PROGRESSIVE
TENSES
Present progressive
Past progressive
Future progressive
Present perfect progressive
Past perfect progressive
Future perfect progressive

http://webster.commnet.edu/HP/pages/darling/grammar/tenses/tense_frames.htm