Philosophers have long argued on context. From their argumentations, it is clear that context is not an isolated issue, but closely related to the value and meaning of language. The first part covers the study on the value of language in context. The standard of the value of the speaker's utterance is different from that of the hearer's. The second part studies the meaning of language at the word and sentence level and analyses a conversational interaction in detail. Context serves intention which lies in the core of communications. The third part illustrates the...