supposed to
s'posta
/ˈspoʊstə/ElisionReductionAssimilation
In real speech
What happens to the sounds
The first syllable su- disappears, the d before t is silent, and to becomes /tə/: supposed to → “SPOHS-ta”.
When to use it
Expectations and rules: You're supposed to be here. How was I supposed to know?
Casual → formal
Slang
s'posta
Neutral
supposed to
Formal
expected to
Sound notes
Elision: a sound disappears completely (often t, v, h or th).