Answer:
1) Had been watching - Verb Phrase
2) Little blue bird - Noun Phrase
3) Going dancing - Verb Phrase
4) Sweet, sad smile - Noun Phrase
5) Will go shopping - Verb Phrase
Explanation:
A noun phrase is a phrase that contains a noun and at least one modifier before or after the noun.
— The noun phrase “little blue bird” contains a noun (bird) and two modifiers (little, blue) before it.
— The noun phrase “sweet sad smile” contains a noun (smile) and tow modifiers (sweet, sad) before it.
A verb phrase is a phrase that consists of a verb and other auxiliary verbs.
—The verb phrase “had been watching” contains the main verb (watching) other auxiliary verbs.
— The verb phrase “going dancing” contains the main verb (dancing) and an auxiliary verb.
— The verb phrase “will go shopping” contains the main verb (shopping) and other auxiliary verbs.