Translation guide
The English verb "vary" covers several related ideas: things differing from each other, something changing over time or by situation, and intentionally making changes. Japanese uses different expressions for each nuance.
To say that things are not all the same; they differ depending on the case.
Used to state that two or more things are different. Often in the form 〜によって異なる (differ depending on...).
Opinions vary from person to person.
Customs vary by region.
Means 'are various/diverse'. Emphasizes variety rather than direct comparison.
The reasons vary.
Similar to 様々 but often implies inconsistency or lack of uniformity, sometimes with a negative nuance.
The quality varies (inconsistently).
To say that something is not constant; it changes depending on conditions.
General verb for 'change'. Use 〜によって変わる for 'vary depending on...'.
Plans vary depending on the weather.
The scenery varies with the seasons.
More formal than 変わる. Often used for measurable or systematic variation.
The temperature varies greatly.
Literally 'not constant'. Used when something is unstable or fluctuates.
My income varies.
To say that someone changes something to add variety or avoid monotony.
Transitive verb meaning 'to change something'. Use when the subject actively makes a change.
I vary the menu every day.
Try varying your way of speaking.
Means 'to add variation'. Often used for routines, designs, or performances.
I want to vary my daily life.
Means 'to diversify'. Used for making a range of things more varied, often in business or social contexts.
Vary the product lineup.
異なる describes a static difference between things. 変わる describes a change over time or in response to conditions. Do not use 異なる for 'change'.
English 'vary' often translates naturally to 〜によって異なる or 〜によって変わる. A direct translation like バリーする does not exist.