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I agree, but people here study Russian, not only "speaking" Russian, you here in the streets? Or am I wrong?

anyones opinion is quite humble, mine is not exception.

Example you asked, first which came to my mind.

Archeologists found a strange artefact, and discuss, what it can be.

- Я думаю, что...

sorry, I skipped part of your sentence. Anyhow "weird" is quite humble opinion, isn't it? I can find a few variants when such sentence does not sound weird.

что тут грамматически неправильно?

"этот черепок является кусочком древнеиранского кувшина эпохи Ахаменидов".

Что в этом предложении неправильно?

быть/есть

пример: "эта штука является ключом" или (а то опять ВЕШ меня раскритикует: "эта штука, на самом деле, является ключом".

Значение: this thing is a key.

ВЕШ, I totally disagree, sounds pretty Russian to me. Yes, your sentences are more completed, but anyhow, my variants are fine as well.

saibot is right as well.

I think the first pair is quite equal, not much difference in use. There are some minor, but that would be for high level, even native knowledge of Russian. For example: "Я использовал лошадей" -...