short or long vowels

how do you know when to either use ,promuonce the short or llong vowel sound? [Email deleted.]

[RonBee]

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English Idioms
http://www.usingenglish.com/forum/viewtopic.php?t=1697

Brief Verse (Couplets)
http://www.usingenglish.com/forum/viewtopic.php?t=1579

Prepositions
http://depts.gallaudet.edu/englishwo.../main/prep.htm

• I can feel the cold winter winds blow,
  And I know that soon there will be snow.

8)

[Tdol]

It's hard to come up with rules for such things because English spelling is so chaotic. While this is far from universal, single vowels tend to be short and two or double ones tend to be longer.