"Grammar is not just concerned with syntax, however. the way words are formerd- and can change their form in order to express different meanings-is also at he heart of grammatical knowledge. Thus, form example, we cam modifiy the form arrive by adding-d to make arrived, so that the verb now refers to the part. if we replave e with- ing to make the form of arriving, the verb now indicates continuity. we call the study of this kind of word formation morphology. speakers of a language have a good knowledge of morphology, for if they did not, they would not be able to say I arrive, but then changes this to he arrives". HARMER,J.the Practice of English Language Teaching(5th Edition).Harlow: Longman- Pearson,201.p.32. Which of the fallowing statements IS NOT relatec to morphology?