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I read that ... to ii na to omoimasu means "I hope that ...". Is the na here a final particle that adds the first person's subjective feeling to the proposition as in sawa’s answer to using なafterい-adjectives?
... to ii na to omoimasu
Yes, it is. It is the sentence final particle.
「と」 is also the quoting particle. Used as such, it is allowed to follow what would normally be considered a complete and independent sentence.
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