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I'm confused. Your sentence seems to be missing some word or words.

Why?

Well for one, the sentence "I think this sparrow bird..." should either continue, or maybe it needs an additional verb and an adjective somewhere.

"I think this is a beautiful sparrow",
"I think this sparrow is beautiful"
or
"I think this sparrow is a bird." (Which is kind of weird, because it naturally is a bird, you don't have to think it is a bird.)

ohh sorry
I am 14 years old and I can not write English language well. So wrong.