Identify the infinitive phrase and its use. The scientist tried to learn new ideas from his experiments.
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:
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?