He was astonished to find that his entire apartment had been ransacked.
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I was astonished to find just how easy it was to answer the question.
She was astonished by the incredible magic trick he performed at the party.
Astonished means very much surprised. This student was astonished to discover that the teacher knew this sentence had been plagiarized.
astonished
The nouns in the sentence are:sky, the subject of the sentence (a word for a thing);blue, a predicate nominative (a word for a thing).