The Particle Is に, Not を
慣れる is intransitive, so what you get used to takes に:
- 新しい仕事に慣れました。(I've got used to the new job.)
×仕事を慣れる is the standard error, and it comes from translating "get used to" as though it took an object.
Verbs Need の
To get used to doing something, nominalise the verb first:
- 早起きするのに慣れた。(I've got used to getting up early.)
慣れている vs 慣れた
| Form | Meaning |
|---|---|
| 慣れた | the moment of becoming used to it |
| 慣れている | the ongoing state of being used to it |
Describing yourself now, 慣れています is usually what you want. This mirrors every other change-of-state verb — see ている.
慣らす — The Transitive Partner
慣らす means to accustom something else: 体を慣らす (acclimatise your body). The pair follows the ordinary intransitive/transitive split.