ko ng ... or kong ... apply ligature or not ?

Jimmy, good question but:
1.plural interrogative pronouns are not common
2.the interrogative particle ba is not used together with an interrogative pronoun, though there is an exception, to emphasize.
3.the ligature ng is also a possessive marker, so not always attached
However, I am not sure what you want to say, maybe just: ano ang mga klase sa sayaw doon?

Thanks a lot for your kind reply. Let's forget about the text example I gave ... because it might lead us apart from the real background of my question. I understand from your reply that the posessive marker "ng" does not underly ligature ... that helps me a bit ... it seems to indicate where to look for.But still I dont understand, why it is sometimes "ko ng" ... and sometimes "kong" ... And just the same with "mo ng" and "mong" ... etc. etc. In general: when do I have to combine "ng" with the previous word and when not. It seems, that everytime I use such a construct in one of my conversations, it's wrong ... The people I talk to are native Tagalog speakers ... so they can tell me it's wrong (and I believe it), but they can't explain why ... I think I lack some basic grammar rules about ligature .... I hope I could make sufficiently clear what's my problem ... maybe some of the grammar gurus in this forum can help me out ... kind regards
Jimmy

Gusto ko ng isda. > I want fish.
Gusto kong kumain ng isda. > I want to eat fish.The "ng" marks the noun.
The "kong" usually comes when the next word is a verb.NG the linker (actually NA), and NG the marker are not the same.Linker: learningtagalog.com/ grammar/forming_and_ connecting_words/na_ ng.htmlMarker: learningtagalog.com/ grammar/markers/comm on_uses_of_ng_marker s.html

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wow ... great this is exactly what I was looking for ... thanks a lot ! linkers are underlying legature ... markers are not ... I hope I got this right ! Just a little correction for those who might also try to follow your URLs ... there are some slight typing errors in the second link ... it should be: markers: learningtagalog.com/ grammar/markers/comm on_uses_of_ng_marker s.htmlYou made my day ... Kind regards
JimmyEdit: oops ... I have entered the URL correctly ... but it appears the same way as yours ... maybe this is a system error ... To overcome this, do the following: Goto: learningtagalog.com/ grammar/markersRemove the blank in front of "grammar" and open the URLAnd then select: Common Uses of Tagalog Ng Markers

Not sure, my links and your links both work for me when I click on them. I think the site just displays them weird on purpose but they click ok.@Jimmy329

It probably depends upon the browser and its settings, whether it gets along with that kind of URLs or not ... I get a 404 error (page not found) ... but it's ok ... I just remove the blanks that were inserted and then it works out fine ! So let's forget about the matter ... Thanks again ... and have a nice day ! @AMBoy

His links work fine . I second Amboys explaination here .

it's funny that your tagalog friends didn't know the secret existence of NA in Tagalog sentences. Native speakers never experienced actively learning the language thats why. its good someone has explained it to you. NG is OF, while NA is WHICH IS/THAT

Ng is not always of. It can mean multiple things like being used as a marker.