何か

1. Origins, structure, and basic meaning

• Structure: 何か is read as なにか and is an indefinite pronoun referring to something unspecified or unidentified.
• Basic usage: Something to eat appears in 何か食べるもの, while an unidentified subject appears in 何かが落ちる.

2. Common pitfalls and similar expressions

• Particles after the expression
  • After 何か, a particle can mark its role in the sentence, as in 何かが or 何かを.
• Difference from 何も
  • 何か refers to some unspecified thing, while 何も commonly combines with a negative expression to mean nothing or not anything.