What is the meaning of -kaan?

neither, not ... either (also not)

Used to emphasize lack of alternatives.

Used to soften a question, e.g. when the speaker is asking to be reminded of something, or when the speaker is seeking agreement or confirmation.

Emphasizes a negative (lack of) action.

even (implying an extreme example)

Used to indicate change of mind or circumstances; indicates confirmation of not doing something, e.g. if someone doubts it, or, when someone is more or less surprised at an occurrence, indicates the reason why some thing was not successful – which is by not doing that something

-ever

Used to form exclamations of wonder, with clauses that begin with an interrogative.

Source: wiktionary.org