[verb ます-stem] + 続ける
The auxiliary verb つづける続ける (つづける) attaches to the masu-stem of a verb to express continuing or keeping on doing an action. It emphasizes that the action persists over a period of time without stopping.
Remove ます from the polite form of the verb and add つづける続ける:
Because つづける続ける emphasizes persistence, it is used to describe dedication, effort, or endurance over time.
Since つづける続ける is a regular る-verb (ichidan verb), it conjugates normally:
While 〜~ている describes an action in progress at a point in time, つづける続ける emphasizes the persistence or continuation of the action. Compare: