ましょう => let's ~; shall we ~ N5
ましょうか => shall I ~; used to offer help to the listener N5
~ましょう。 => Let's (together), Shall I/we…? N5
Verb suffixes
でしょう/でしょうか => Is that right? ask a question in a polite way N5
てもよろしいでしょうか => May I... N4
Allow
でしょう/だろう => right?, isn't it?, correct? N4
でしょう => perhaps, I assume, I believe N4
Speculation
でしょう   => I think; it seems; probably; right? N5
Confirm
でしょう => I think... Probably.., I wonder if... N5
Miscellaneous
てしょうがない/てしかたがない => Very A; Really A; Extremely A N2
Degree, Level, Amount
いじょう => that's all N4
Result
いじょう => more than N4
Standard