German phrase
Ich glaube, ich muss ~.
Meaning
I think I have to ___
When to use it
You think action is needed. It gently shows duty, with some hesitation or uncertainty.
Example dialogue
Ich glaube, ich muss zum Arzt gehen.
I think I have to go to the doctor.
Warum? Geht es dir nicht gut?
Why? Don't you feel well?