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This paper describes and analyzes the grammaticalization processes and semantic changes such as as/so long as, as/so far as, when and whenever and the frequency of these conditionals. Conditionals are grammaticalized from various lexical sources. This paper addresses conditionals have developed from temporals. This study also examines semantic change involving metaphor, metonymy and semantic generalization. When temporals develop into conditionals, we can find an ambiguity. This paper mainly addresses the issues of semantic change involving metaphor, metonymy and semantic generalization. Metaphor and generalization are closely related. These multiple mechanisms operate simultaneously or successively. Metonymic transfer is defined as a change essentially triggered by the contiguity relationship between two entities or events, and therefore, does not involve changes of ontological domains. Generalization is a process whereby the range of use of a linguistic form becomes greater by virtue of its losing semantic specificity. Generalization pattern in this paper goes from physical elongation to serialized causality.