i: ivory, international
w: wind, wine
e: edward, equation
Listen to the pronunciation of words. Observe how the i changes from ivory (aaaeee) to international (e), w changes from wind (v) to wine (y), e changes from Edward (ei) to equation (e).
Best is not to reason why’s of it. Try and get accustomed to the fact. Fact being that when alphabets combine, different pronunciations ought to arise.