Once is an adverb.
They is a pronoun.
Were is a linking verb/verb.
On is a preposition.
The is a preposition.
Boat is a noun.
It's an adverb.
It is an adverb because it tells when the verb occured.
The word 'once' is an adverb in the sentence 'A local woman once found a narwhal tusk'. The word modifies the verb 'found'. Modifying another part of speech, such as an adjective or a verb, is one of the responsibilities of an adverb. The word also answers a question that the verb asks. For example, the verb 'found' asks the question of 'when'.
"Once" is an adverb.
The adverb in the sentence is "Once," as it describes the timing or frequency of the action in the sentence.
"At once" can function as both an adverb and a conjunction in a sentence. As an adverb, it typically means "simultaneously" or "immediately." As a conjunction, it can signal a contrast or unexpected result.
adjective
Certainly. Once I ate an apple.
'Once' is an adverb in the phrase 'at once,' because it modifies the verb 'to be' in this context. It indicates immediacy or simultaneity.
"You once met the prime minister." is a correct sentence.
The man who was always once in this once in this once in that was frolicked by the amazement of the opocolips
If you only use a word "once" in sentence, it only appears one time.