Question

He is very nice change into exclamatory

Answer 1

How nice is he ! ......

:-)

Answer 2

A changed exclamatory sentence is: How nice is he.

In English grammar, an exclamatory sentence is a typical principal clause that delivers strong expression by making an exclamation.  

An exclamatory sentence usually stops at the end with an exclamatory point symbol (!).

With the appropriate notation, other sentence types particularly and especially declarative sentences—can be applied to form an exclamatory sentence.