Which prefix means not or opposite of: 'possible' → 'impossible'?

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Multiple Choice

Which prefix means not or opposite of: 'possible' → 'impossible'?

Explanation:
Negating a word with prefixes like un-, in-, im-, and non- creates opposite meanings, and the spelling changes to fit how the word sounds. Before certain sounds, especially the lips’ sounds p, b, and m, the negating prefix shifts from in- to im- to make pronunciation smoother. That’s why the opposite of possible is impossible, not inpossible or unpossible. The form non- isn’t used here in everyday English, and in- before p becomes im-, so the standard, correct form is impossible.

Negating a word with prefixes like un-, in-, im-, and non- creates opposite meanings, and the spelling changes to fit how the word sounds. Before certain sounds, especially the lips’ sounds p, b, and m, the negating prefix shifts from in- to im- to make pronunciation smoother. That’s why the opposite of possible is impossible, not inpossible or unpossible. The form non- isn’t used here in everyday English, and in- before p becomes im-, so the standard, correct form is impossible.

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