You want to say a repeated action has worn in until it feels natural, and its absence would feel wrong.
序 · The move
1name the actor and the repeated actis the point that the doing became habit, not that it happened once?
2stick 慣 to the back of the verbdoes 慣 sit right after the verb, before any object?
3add 了 to mark the habit as now in place, then the object if there is onedoes this report a settled state of being used to it, not a single finished event?
4to negate the can't-get-used-to-it sense, use the potential form V不慣V不慣 (can't get used to it), never 不 in front of the verb?
例 · Examples
1他he已經already過live (a life), pass (days)慣suffix — done until habitual了change of state城市的生活city life，去鄉下go to the countryside常覺得often feels不習慣not used to it。
He's lived in the city until it's second nature; out in the country he feels off all the time.
慣 logs that repetition wore the act into habit (吃慣了 = used to eating it); 過 logs that the act was lived through at least once (吃過 = have eaten it before). 慣 needs many times until natural; 過 needs only one, ever.
習慣 is a standalone word (verb/noun: to be used to / a habit) that stands on its own. V慣 is the productive suffix riding a specific verb — 看慣, 住慣, 過慣 — naming which act became habit.
object before the suffix: 他過城市的生活慣了 → 他過慣了城市的生活
negating with 不 before the verb: 他不過慣城市的生活 → 他過不慣城市的生活
using 慣 for a one-time experience: 我去慣了日本 (meaning 'I've been once') → 我去過日本
English 'used to' splits two ways: 'used to do' (past habit, now stopped) and 'be used to doing' (accustomed). V慣 is only the second — a present, worn-in habit — so learners reaching from 'used to' may import a discontinued-past reading 慣 does not carry.
關 · Related
過 — experiential: done beforethe suffix 慣 must be held apart from: 過 = lived through once; 慣 = repeated into habit可能補語 — potential: can or cannot reach resultthe negation V不慣 / affirmative V得慣 is the potential-complement form of this suffix結果補語 — resultative: verb+outcome慣 sits in the result-complement slot, naming the worn-in state the verb reaches