Romeo and Juliet should have followed Lawrence's plan because it would prevent any more trouble and they would stop having to sneak around everywhere to see each other.
The underlined subject of the sentence the skyscraper that was built last year is a noun phrase.When determining the type of phrase, you first need to find its center, of the most prominent word. Here, the center is skyscraper, which is a noun, which means that the whole phrase is a noun phrase.
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