The word astonishing is an adjective that describes something as causing great surprise or amazement; filled with sudden wonder; astounding, confounding, startling. Example sentence:
How astonishing it must have been to learn that the world really is round.
It's astonishing how rude some people can be.
Minoan potters produced an astonishing variety of wares.
No, the sentence "Have an astonishing day" is using the word "astonishing" as an adjective to describe the day. To use the verb form of "astonish" correctly, you could say something like "I hope something astonishes you today."
The Incredible Hulk displayed astonishing strength.What they found on the surface of the new planet was astonishing.The astonishing light blinded the driver.
His caginess is astonishing. Caginess is another word for shrewd.
Minoan potters produced an astonishing variety of wares.
The way you sang tonight was astonishing. I'm impressed
All of the different types of creatures roaming for food in that area was truly astonishing.
Her equanimity during the ominous trial was astonishing to her husband and family.
Creativity means the ability to come up with new concepts or art. Her creativity is astonishing.
You can use the word Truss in a sentence like this.
Can you use the word concluding in a sentence? Done.
Yes, indeed I can:"I joined the choral class in school because I like singing in a group.""The choral festival was astonishing.""The Messiah is an oratorio containing many awe-inspiring choral parts."