Unfortunately there are no rules to this issue when relating to the English language. Example of this problem is highlighted with the word "wind". It can be pronounced in two different ways meaning two different things.
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Anonymous How do I know when to use Short, medium, long, soft hard vowels and Consonants when speaking?I think the best advice anyone can give you is to pronounce words as they are given in dictionaries. Those which have an audio feature are especially useful in this way. And always imitate the pronunciation of native speakers.