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"In today's Maths class, one moment he says two and three is five. But the next moment he says one and four is five." Mike answers.
I think the sentence mentioned above is not that authentic. I wonder whether the native speaker will use it like this.
Is "one moment" omitted from "for one moment"? If not, can a noun phrase function as an adverb?
It is a commonly used phrase for native speakers. It is not a shortened version of "for one moment." It can be considered a shortened version of "at one moment." "One moment" is equivalent to "one time" or "once." It has no duration. "For one moment" has the duration of a moment, which is not a specific duration, and certainly is not long, but it is a duration.
