Is there any trick to distinguish whether oo is pronounced as a long sound or a short sound?

OO basically has two pronunciations. One is the long vowel /u/, which is in front of voiced consonants (such as d, n), such as:

moon moon< /p>

noon noon

ooze ooze

mood tone

food food

Another one, pronounced as a short element /?/, mainly in front of unvoiced consonants (such as k), such as:

cook cooking, cooking

foot feet

book book

p>

oops

There are some exceptions, such as:

good Okay

oomph Enthusiasm

stood Standing (past tense)

I hope I can help you clear up your doubts.