Foreign language teaching has been in contact with linguistics and psychology，and more recently with psycholinguistics，for a sufficiently long period of years to draw certain conclusions from this experience.Like linguistics and social science，psychology and psycholinguistics are growing fields of study.

To sum up from the point of view of language teachers this review of trends in linguistics are up to the following points：

（a）A new situation was created for language pedagogy by the development of a science of language in the course of the present century.

（b）Language teaching theory cannot disregard a discipline that shares with its central concern for language.

（c）We have found much common ground between the problems faced by linguistics and those faced by language pedagogy.

（d）Linguistics is an active and growing field of study，far from approaching a state of finality.Theories battle with each other.New concepts，new models and changes in emphasis come and go.It is not surprising to find that this prolonged state of unrest and agitation creates problems for a language pedagogy that attempts to take linguistics into account.

（e）In certain respects the perspectives of linguistics and pedagogy are different.A major preoccupation of linguistics is the development of theory of language.Another is the creation of conceptual tools for the description of natural languages in general.Language pedagogy has a practical objective，effective language learning：and it is committed teaching of particular languages.There is therefore a difference in purpose and function between the role of linguist and language educator，and we must expect to find that the practical need of language teaching as an applied activity and the theoretical interests of linguistics as a science do not always coincide.

The general function of psychology in language teaching theory is no longer in doubt，and a broad demarcation from linguistics and sociolinguistics can be indicated.While linguistics and sociolinguistics are concerned with language or language in society in general and scientific approaches to particular languages and speech communities，psychology directs our attention to the individual person（a）as a language user，and（b）as a language learner.Since language teaching is concerned with the acquisition by individuals of a dual language command，its theory is bound to operate with linguistic and psychological concepts of language use and language learning，and psychological thinking on these topics forms an essential part of any language teaching theory.

Until recently，the relationship between foreign language pedagogy with linguistics and psychology was viewed almost exclusively in terms of receiving and applying information，gaining direction from studies carried out in other language learning and teaching.However，the task is never one of simple application alone，and more recently，the need for direct psychological studies of foreign language learning has been recognized.As a result，a more reciprocal relationship between psychology and language pedagogy has developed.