What it means
何も〇〇ない means that nothing is done, used, received, or experienced. It combines 何も with a negative predicate and emphasizes the complete absence of the action or result. The predicate is normally a negative verb, and the pattern can describe a specific situation, time, or context. In familiar speech, the ending is usually ない; in polite speech, the corresponding negative ます-form is used.
Usage note
何も must be followed by a negative predicate. With an affirmative predicate, 何も usually means “anything” in a question or conditional context rather than “nothing.” Do not confuse this pattern with 何でも, which means “anything” or “everything,” depending on context.
How to use it
何もVerb (ます-stem)ません
私は朝食に何も食べません。
I eat nothing for breakfast.
何もVerb negative stemない
私は朝食に何も食べない。
I eat nothing for breakfast.