Here's the breakdown:
* o - The first vowel sound is a long "o" sound.
* p - The second sound is the consonant "p".
* p - The third sound is also the consonant "p".
* o - This is where the schwa sound comes in. It's the short, unstressed vowel sound, often represented as "ə".
* s - The last sound is the consonant "s".
So, the pronunciation of "oppose" is roughly: ə-POHZ