I am very interested to find out a rule which can help me to pronounce correctly the words which contain the letter "i".
For example: nine vs. injury vs. provide... These are some examples which put me in difficulty when I try speaking in English.
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You're looking at the wrong letter.
Nine and provide are both examples of the silent E rule.
In a nutshell, in many words where there is another vowel preceding the E in the same syllable, the E is not pronounced. Instead, the other vowel is pronounced with its long sound. This is idiomatically described as "the other vowel says its own name."