My teacher corrected...

[JohnFleabass]

I wrote:
The world`s leading industrial nations have a say in most issues concerning less developed countries.

Look it up in the Oxford dictionary page 742

She says it is the world`s leading industrially nations..

[rewboss]

She's wrong. "Industrially" is an adverb, and adverbs modify verbs, adjectives or even entire sentences. The word as used here modifies "nations", which is a noun, and so should be an adjective. "Industrial" is indeed correct here.

Google agrees. A search for "industrial nations" (including the quotes) returns over half a million pages; a search for "industrially nations" (including the quotes) returns one solitary result, and in that result, "industrially" is the end of one sentence and "Nations" the beginning of the next. In other words, nobody else uses the phrase "industrially nations".

[MrPedantic]

Hello John

I'd agree with Rewboss. Perhaps your teacher is thinking of a structure like this, where an adverb qualifies an adjective:

1. The world's industrially prominent nations...

MrP

[JohnFleabass]

Okay thank you so much. I will correct her today.

[Casiopea]

Welcome, John.

[MrPedantic]

Be gentle with her, John...

[JohnFleabass]

First she hesitated but then she admitted her fault. She always compaired it with "industrialized countries". I show her the Oxford Edition 7 and let her read: the world´s industrial nations

Industrally countries was my fault, she meant industrialized nations.

[Casiopea]

But . . . "industrialized nations" is correct.