Longing,

How do americans pronouce the nasal ŋ.
Is it mostly merged with N or is it not?

This is very confusing because I've been to the states many times and It doesn't matter where I go, it seems like everybody pronounces prhases like "long ago" as "lonna go" or "long island" as "lon I lunnd", the only place in where I notice I different pattern was Cali, where they so pronounce ŋ. Also the G in singing, longer and younger is pronunced, but every website about american accent and all dictionaties I've seemed so far don't ackownledge this fact, Am I just mistaken?

No, I did not go to New York.

"In colloquial English -ng often sounds like -n at the end of a word."

So, that means that you pronounce "n" instead of "ŋ" at the end of such words?

And also, I noticed that the M-W.com pronunciation or "singing" is "siŋiŋ" while the pronunciation for "longer" is "loŋger". In words like that, How do you know when the "g" is pronounced and when it's not?

>>So, that means that you pronounce "n" instead of "ŋ" at the end of such words?<<

I'd have to agree with M-W.com here. Both instances of "ng" in "singing" as nasals is the most common pronunciation, hence "siŋiŋ". Though I don't say "siŋin" with a hard final "n" consonant, it can also be heard but is colloquial.

>>And also, I noticed that the M-W.com pronunciation or "singing" is "siŋiŋ" while the pronunciation for "longer" is "loŋger". In words like that, How do you know when the "g" is pronounced and when it's not? <<

I don't know why a "g" consonant is commonly pronounced in "longer" yet for "longing" neither "g" is pronounced. Strange... I don't think there's a rule....

Another thing, there are some people who actually pronounce a consonant "g" in "long" which can come across as a "k" hence you think you hear "lonk".

Where are you from originally?

hi

<<
This is very confusing because I've been to the states many times and It doesn't matter where I go, it seems like everybody pronounces prhases like "long ago" as "lonna go" or "long island" as "lon I lunnd", the only place in where I notice I different pattern was Cali, where they so pronounce ŋ. Also the G in singing, longer and younger is pronunced, but every website about american accent and all dictionaties I've seemed so far don't ackownledge this fact, Am I just mistaken? >>

Well I'm from California and I definitely have /N/ (/ŋ/) where you indicate but that's hardly unique to this state.

It's worth noting that the "-ing" forms of verbs are commonly pronounced both with [N] and [n] in everyday speech even if people don't realize they actually do use [n] sometimes.

As with many/most other people I have no /g/ in "singing" but I do in "longer" and "younger."