1) What kind of language is of interest? from normal native speaker adults today. Then it could be spoken or written, standard or non-standard, UK or US or..., from everyday language or the specialist register of newspapers or poetry or academic prose or...etc. from the past. Literary or not... from foreign language learners from normal native speaker children from speakers with language disabilities (e.g. aphasics) 2) What level(s) of language are you interested in? vocabulary/lexis grammar/syntax sounds, intonation spelling, punctuation text/discourse/rhetorical structure pragmatics ....هاد كلام ما شرحو اقرءو بس قراءه سهل ومعانيه اسهل