Is it onto the next or on to the next?
It’s “on to the next” when using this phrase with phrasal verbs like “move on” or “go on” that mean continue (e.g., “Now, let’s move on to the next topic”).
“Onto the next” would suggest physically moving onto something that is next in a sequence, as “onto” is a preposition that means “on top of” or “upon” (e.g., “Now, jump onto the next platform”).
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