Grammar

1. The business of taking a language to pieces to see how it works. The field of grammar is often divided into two main areas, they are syntax and morphology.
   

2.                                         (Crystal, David 2004. Rediscover Grammar Third Edition)
   

Syntax

1. ‘Syntax’ means ‘sentence construction’: how words group together to make phrases and sentences.
   

2.                                         (Tallerman, Maggie 2005. Understanding Syntax Second Edition)
   

Context

    The non-linguistic situation in which language is used.

                                            (Crystal, David 2005. The Cambridge Encyclopedia of Language Second Edition)

Accent

    A type of emphasis given to a spoken word or syllable.

                                            (Crystal, David 2005. The Cambridge Encyclopedia of Language Second Edition)

Pronunciation

    The sound a word or part of a word makes.