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What is the part of speech (word class) of to-infinitive?

as example:

I forgot to send the letter.

I: the part of speech (word class) is pronoun and the word function (clause element) is subject.

forgot: the part of speech & and the word function is verb.

to send: ??

the letter: the part of speech is noun (the is determiner) and the word function is object.

  • to send the letter is the object of the verb forgot, the letter is the object of the verb send. – user178049 Mar 7 '17 at 11:07
  • The part of speech is a verb, more specifically, non-finite verb. – user178049 Mar 7 '17 at 11:13
  • "To send" is not a single constituent, but two separate constituents: 'To' is a "subordinator" functioning as "marker", and 'forgot' is a plain form "verb" functioning as "predicator" (head of the verb phrase forgot to send the letter). – BillJ Mar 7 '17 at 11:37
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In traditional grammar, the infinitive ("to X") is a noun, the form of a verb that names the action of the verb.Daily Grammar.

I want to play the piano.

The subject is "I". The verb is "want". The direct object is "to play" the indirect object is "the piano".

Among current grammarians, however, infinitives are not thought of as nouns in English. A summary of some current thought may be found here: Education First.
For the best understanding of how such forms as infinitives might be viewed by grammarians, one will need to study from time to time what is written about them.
In your example:

I forgot to send the letter.

"to send" is the direct object of "forgot", no matter what part of speech it might be.

  • Not my DV, but the piano is the obj for play not the indirect object. Play is a monotransitive verb, it takes only one object. – user178049 Mar 8 '17 at 11:37
  • @178049... I was sure the verb in the sentence was "want" – J. Taylor Mar 8 '17 at 17:06
  • This is counter to actual understanding of such complements and clauses. See here for a basic syntactician's view. "To send" is a verb ("send") that is given inflection by the infinitive marker "to". – eijen Mar 8 '17 at 17:37

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