"With me or with Duo."

[kensax]

Why is the suffix form not possible with Duo?

[Selcen_Ozturk]

Duo'yla is possible

[ChickenRunner02]

Why is there a 'y'?

[Laura847169]

because Duo ends with a vowel :)

[R_Andersson]

Yes, just as Laura said, it is a vowel buffer that is used when the noun ends in a vowel. It is also used with all the other cases.

[KianSwami]

Is it wrong if i say benimle yoksa duo ile ?

[AlexinNotTurkey]

You would have to use the question particles in this case.