Respuesta :

The infinitive phrase in the sentence is 'to learn new ideas from his experiments' since it has the (to + simple form of the verb + modifers). Its function is a noun because it is the direct object for the verb 'tried'. 

Answer:

infinitive phrase: to learn new ideas

Just remember that an infinitive phrase is a group of words that use an infinitive condition to + verb. Therefore, its use is to express action in the sentence working as a noun because it answers the question ''what?'': What did the scientist try?

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