必ずしも

必ずしも is used to negate a general assumption or expectation. It signals that even if something is common, typical, or likely, the statement that follows is not guaranteed in every case. It often appears when contrasting a general belief with a specific counterexample or nuance. In spoken Japanese, it softens absolutist statements and introduces caution about conclusions drawn from limited evidence. Typical patterns include attaching a verb in negative form with 必ずしも (e.g., 必ずしも〜ない) or using ～とは限らない / というわけではない to express that something does not necessarily apply. Typical contexts: when a result seems likely but not certain, when survey results are not universal, or when personal experience contradicts a general assumption.