there is a sentence.

"one way to change things is to talk to the company's management."

above the sentence,

i think that the first underlined group of words is infinitive clauses.

and then, the second underlined group of words is infinitive phrases.

isn't it correct?

i found it on the internet.

but someone say that "to talk to the company's management" is infinitive clauses.

because subject is dropped.

this is called non-finite clause.

which one is correct?

please help me.


[One way to change things] is to talk to the company's management.

Both the underlined elements are infinitival clauses. Note that "one way" is not part of the infinitival clause, which is just "to change things", which modifies "way" in the bracketed noun phrase.

Infinitival clauses (and gerund-participial / past participial) clauses are non-finite.

Note that most non-finite clauses have no overt subject, but we can usually recover a subject from elsewhere in the discourse, or from the context. They are called non-finite because they are untensed -- they cannot be main clauses.


You are mixing grammar systems, which is always unwise and leads to confusion.

Traditional grammar - any group of words which forms a lexical element and does not have an inflected verb is called a "phrase".

Modern grammar - any group of words which forms a lexical element and has a verb (finite or non-finite) is called a "clause". Phrases have a head word plus optional modifiers which gives it their name. Examples are noun phrase, verb phrase and prepositional phrase.

In traditional grammar, the words you underlined are phrases.

In modern grammar, the first is a noun phrase. The head word is the noun way, and it has a pre-modifier "one" and a postmodifier, an infinitive clause. It is the subject in the main clause.
The second is a non-finite clause. It is the complement of the verb in the main clause.

If you look at random sites on the internet, some will use traditional grammar, some will may use traditional grammar, and some may use modern grammar.

BillJ has given you the modern grammar details.