กฎ in inglese:

golden rule

As a general rule, it's simple to criticize, but difficult to produce alternative suggestions.

Ironically, that old grammar rule that says "never end a sentence with a preposition" does just that!

If you want a golden rule that will fit everybody, this is it: Have nothing in your houses that you do not know to be useful, or believe to be beautiful.

Many have suffered oppression and misery for a long period of time under the rule of colonialism.

It is not reasonable to suppose that this rule is applicable under any condition.

The employees treat everything the company president says as a golden rule.

The reason the Northern and Southern Dynasties had failed in their rule was that they allowed literary splendor to surpass real substance.

Our school administration decided to do away with that school rule.

It is a firm rule in newspaper articles that second-hand information is clearly noted as such.

Buying books would be a good thing if one could also buy the time to read them in: but as a rule the purchase of books is mistaken for the appropriation of their contents.

to break (= not obey) the rules. to obey/follow the rules You can't smoke at school, it's against the rules (= not allowed).

We don't drink booze. Foam rules around here.

One of the rules at my school is that we can’t use mobile phones in the classroom.

In formal situation, it is a good idea to follow standard rules when making new contacts.