Grammar fix
as a rule
generally true
Used to describe what normally happens, while allowing for some exceptions.
expression
How oftenCommon
LevelB2
Used inSpeech & writing
Hear it in context
Notice where the phrase sounds natural.
As a rule, I keep my weekends free for family and friends.
As a rule, I prefer working in the morning because I can concentrate better before I get tired.
Fix the pattern
One small grammar move makes it sound right.
Not: As rule, I avoid driving at night.
Say: As a rule, I avoid driving at night.
The expression needs the article 'a'.
Don't confuse it
Other ways to say it
Happens in most cases
How formal?ConversationalMore measured
nine times out of tenConversational emphasis; usually an estimate, not an exact count.more often than notSomething happens more often than the alternative.
as a ruleYou're here · A general habit or pattern, allowing exceptions.