The word sentences is a noun. It is the plural form of sentence.
The term for knowing a word's part of speech in order to appropriately use it in a sentence is "word-usage."
In the part of speech, the main verb is the word that expresses the action or state of being in a sentence. It is the key element that carries the meaning of the sentence.
In this sentence, "seemed" is the verb.
The word penalty is a noun. A penalty is a legal sentence.
The word "assumes" in this sentence is a verb. It is the action that the subject "their speech" is performing in taking on the accents of 17th-century England.
it depends what word it is it could be any part of speech depending on the sentence
What "part of speech" is the word "said?"
The term for knowing a word's part of speech in order to appropriately use it in a sentence is "word-usage."
It is a verb.
By use of the word in a sentence.
A word is a part of speech, not a sentence like the one in your example.
The use of the word in the sentence derminates the part of speech
The word 'this" in the sentence is an adjective describing book.
it is an English speech
The word 'in' would be a preposition in the example sentence you gave.
Adverb
Girlfriend is a noun.