 When Grice talked about conventional implicatures he was referring to semantic implicatures, like [3c]. These exist because of conventions that give individual words or syntactic structures their meanings. The queen is English and therefore brave implicates “Being brave follows from being English” because it is conventional for English speakers to use “therefore” with a certain meaning, which determines the implicature. A conversational sentence implicature is not determined by the meaning of the sentence used, even when sentences with the same form are conventionally used with that implicature. It is a second-order convention: a convention to use a sentence of a given form with an implicature that is not part of its meaning. The common modes and figures of speech are also second-order conventions, but not restricted to sentences with a particular form. A language is defined by first-order lexical and syntactic conventions, not by second-order implicature conventions. In this respect conversational implicature conventions are like naming conventions, word formation rules, intonation rules, speech act rituals (e.g., saying “This is N” when answering a telephone), and indirect speech act conventions (e.g., asking “Can I get an N?” to request an  N).[75]  Second-order conventions are not as arbitrary, though, because there is always some antecedent relation between what the sentence means and the implicature that makes it natural to use one to convey the other. Implicature conventions promote style, politeness, and efficiency as well as communication.