Some text books suggest that 么 is an interrogative modal particle.
So in what sense is 这是什？ Different in tone than saying 这是什么？
Likewise if you say 这本书是你的吗？ Is saying 这么本书是你的吗？ Less aggressive?
这么大 I can see that in this sentence there is a difference than if you were to say 这是大。
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