Unsung song or not sung the song - like spell?

To determine how to write the particle, together with the word or separately, we must first understand what part of speech is before us, and then we remember a specific rule. Here in this case we are dealing with a sacrament. We need to remember the following rule: if the participle has the dependent word, while NOT written separately, and if the dependent word is missing, write NOT with the word should be together. So, if the sentence used the phrase "unsung song" without the dependent word, and we need to write together. But the example sentences, which are NOT written separately from the word "sung": Not sung last night the song was bugging me and begged out.\r\n\r\NIN this sentence is dependent, the words "last night". Not sung (when?) last night.\r\n\r\poetomu we wrote separately.
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