... realised in language A as Y, is rendered in language B. He considers CA as a form of interlanguagestudy and as a central and substantial component of applied linguistics. As a matter of fact,CA has ... I.? instead of May I.? Yet in fact, canis much more widely used as an auxiliary of permission than may. In asking and givingpermission, can and may are almost interchangeable, the main difference ... nutshell, CA plays an important role in the teaching and learning of a foreign language.It is CA which can work out the similarities and differences between two languagesinvolved, and as a result,...