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I have canonical PROOF that the dragons in the Harry Potter universe, dragons can speak English to humans (or at least wizarding humans)

In Harry Potter and the Deathly Hallows (part 2) when they are busting out of Gringott's bank on the back of the iron belly, right before the dragon flies up and crashes through the ceiling of the lobby, and out into the world. I'd say, a good 15-20 seconds before he breaks the glass ceiling with Potter and company if you listen carefully as the Iron Belly dragon rears his head (and immediately before he flies upward and through the glass ceiling of Gringott's) he says in a very low and lulled tone,

"THANK YOU"

Personally I am assuming that any event found in any one of the Harry Potter films is considered to be concrete fact, and hence, canonical.

I have canonical PROOF that the dragons in the Harry Potter universe, dragons can speak English to humans (or at least wizarding humans)

In Harry Potter and the Deathly Hallows (part 2) when they are busting out of Gringott's bank on the back of the iron belly, right before the dragon flies up and crashes through the ceiling of the lobby, and out into the world. I'd say, a good 15-20 seconds before he breaks the glass ceiling with Potter and company if you listen carefully as the Iron Belly dragon rears his head (and immediately before he flies upward and through the glass ceiling of Gringott's) he says in a very low and lulled tone,

"THANK YOU"

Personally I am assuming that any event found in any one of the Harry Potter films is considered to be concrete fact, and hence, canonical.

I have canonical PROOF that the dragons in the Harry Potter universe, dragons can speak English to humans (or at least wizarding humans)

In Harry Potter and the Deathly Hallows (part 2) when they are busting out of Gringott's bank on the back of the iron belly, right before the dragon flies up and crashes through the ceiling of the lobby, and out into the world. I'd say, a good 15-20 seconds before he breaks the glass ceiling with Potter and company if you listen carefully as the Iron Belly dragon rears his head (and immediately before he flies upward and through the glass ceiling of Gringott's) he says in a very low and lulled tone,

"THANK YOU"

Personally I am assuming that any event found in any one of the Harry Potter films is considered to be concrete fact, and hence, canonical.

I have canonical PROOF that the dragons in the Harry Potter universe, dragons can speak English to humans (or at least wizarding humans)

In Harry Potter and the Deathly Hallows (part 2) when they are busting out of Gringott's bank on the back of the iron belly, right before the dragon flies up and crashes through the ceiling of the lobby, and out into the world. I'd say, a good 15-20 seconds before he breaks the glass ceiling with Potter and company if you listen carefully as the Iron Belly dragon rears his head (and immediately before he flies upward and through the glass ceiling of Gringott's) he says in a very low and lulled tone,

"THANK YOU"

Personally I am assuming that any event found in any one of the Harry Potter films is considered to be concrete fact, and hence, canonical.

I have canonical PROOF that the dragons in the Harry Potter universe, dragons can speak English to humans (or at least wizarding humans)

In Harry Potter and the Deathly Hallows (part 2) when they are busting out of Gringott's bank on the back of the iron belly, right before the dragon flies up and crashes through the ceiling of the lobby, and out into the world. I'd say, a good 15-20 seconds before he breaks the glass ceiling with Potter and company if you listen carefully as the Iron Belly dragon rears his head (and immediately before he flies upward and through the glass ceiling of Gringott's) he says in a very low and lulled tone,

"THANK YOU"

Personally I am assuming that any event found in any one of the Harry Potter films is considered to be concrete fact, and hence, canonical.

I have canonical PROOF that the dragons in the Harry Potter universe, dragons can speak English to humans (or at least wizarding humans)

In Harry Potter and the Deathly Hallows (part 2) when they are busting out of Gringott's bank on the back of the iron belly, right before the dragon flies up and crashes through the ceiling of the lobby, and out into the world. I'd say, a good 15-20 seconds before he breaks the glass ceiling with Potter and company if you listen carefully as the Iron Belly dragon rears his head (and immediately before he flies upward and through the glass ceiling of Gringott's) he says in a very low and lulled tone,

"THANK YOU"

Personally I am assuming that any event found in any one of the Harry Potter films is considered to be concrete fact, and hence, canonical.