Lexical chunk Lexical chunk is an umbrella term which includes all the other terms. We define a lexical chunk as any pair or group of words which is commonly found together, or in close proximity.
Collocation Collocation is also included in the term lexical chunk, but we refer to it separately from time to time, so we define it as a pair of lexical content words commonly found together. Following this definition, basic + principles is a collocation, but look + at is not because it combines a lexical content word and a grammar function word. Identifying chunks and collocations is often a question of intuition, unless you have access to a corpus.
Lexical Chunks (that are not collocations) by the way up to now upside down If I were you a long way off out of my mind
Lexical Chunks (that are collocations) totally convinced strong accent terrible accident sense of humour sounds exciting brings good luck
A theory of learning According to Lewis (1997, 2000) native speakers carry a pool of hundreds of thousands, and possibly millions, of lexical chunks in their heads ready to draw upon in order to produce fluent, accurate and meaningful language. How then are the learners going to learn the lexical items they need?
Criticism : One of the criticisms levelled at the Lexical Approach is its lack of a detailed learning theory. It is worth noting, however, that Lewis (1993) argues the Lexical Approach is not a break with the Communicative Approach, but a development of it.
According to Lewis: Language is not learnt by learning individual sounds and structures and then combining them, but by an increasing ability to break down wholes into parts. Grammar is acquired by a process of observation, hypothesis and experiment. We can use whole phrases without understanding their constituent parts. Acquisition is accelerated by contact with a sympathetic interlocutor with a higher level of competence in the target language.