Translation guide
Expresses that something is generally true or done in most cases, but allows for exceptions.
To state that something is usually the case or is a standard practice.
A common, neutral adverb meaning 'usually' or 'mostly'. Used in everyday conversation.
To describe a fixed rule or standard way of doing things.
たいてい is a simple frequency adverb ('mostly'), while ふだんは contrasts usual state with exceptions. Use ふだんは when implying 'but not today' or 'but sometimes different'.
I usually go by train.
As a rule, I don't eat breakfast.
彼はたいてい朝早く起きます。
As a rule, he gets up early in the morning.
Means 'usually' or 'normally', emphasizing habitual state. Often contrasts with exceptions.
As a rule, I commute by bicycle.
Means 'generally' or 'in general'. Slightly more formal, often used in explanations or writing.
As a rule, Japanese people are polite.
Literally 'as a principle'. Formal and often used in rules, contracts, or official contexts.
As a rule, we cannot accept returns.
Means 'invariably' or 'without fail'. Implies a predictable pattern, often with a nuance of inevitability.
As a rule, he drinks coffee after meetings.
Simple 'always', but can convey 'as a rule' when describing habitual actions. Very common.
As a rule, I go to bed at 10 p.m.
Pattern meaning 'make it a rule to do ~'. Expresses a personal rule or habit.
As a rule, I go jogging every morning.
ふだんは電車で行きますが、今日は車です。
As a rule I go by train, but today I'm driving.
The English phrase 'as a rule' does not have a single direct Japanese equivalent. Translating it word-for-word (e.g., 規則として) sounds unnatural. Choose an expression based on context.
As a rule, we close at 9 p.m.