I can't identify this form (だって)


> Xは、この学校で日本語を勉強したん **だって** 。

Is this the -te form of the copula? Haven't encountered it so far.




って is used as a quotative particle in casual speech. See: [と、て、って Quoting
Particle Usage](https://japanese.stackexchange.com/q/3913/5010)

A sentence can sometimes end with と/って, and it usually means "I heard ～" or
"They say ～". So you can think that 言ってた or 聞いた is omitted after it.

The sentence means "I heard X learned Japanese at this school."




って is used as a quotative particle in casual speech. See: [と、て、って Quoting
Particle Usage](https://japanese.stackexchange.com/q/3913/5010)

A sentence can sometimes end with と/って, and it usually means "I heard ～" or
"They say ～". So you can think that 言ってた or 聞いた is omitted after it.

The sentence means "I heard X learned Japanese at this school."

