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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.