o has the sound of double o long in tomb, womb, prove, move, etc., and of double o short in wolf, women, etc.;
o also has the sound of u short in above, love, some, done, etc.;
u has the sound of double o long after r, as in rude, rule;
it also has the sound of double o short in put, pull, bull, sure, etc.;
ea has the sound of a long, as in great; of e long, as in heat; of e short, as in head; of a Italian (ah), as in heart, hearth, etc.;
ei has the sound of e long, as in receive; of a long, as in freight, weight; sometimes of i long, as in either and neither, pronounced with either the sound of e long or i long, the latter being the English usage;
ie has the sound of i long, as in lie, and of e long, as in belief, and of i short, as in sieve;
ai has the sound of a long, as in laid, bail, train, etc., and of a short, as in plaid;
ay has the sound of a long, as in play, betray, say, etc.;
oa has the sound of o long, as in moan, foam, coarse, etc.