thanks. i investivate the relevance of the use of lexical chunks and L2 oral fluency, and find out something that maybe interpreted by the two principles, i think.The idea was developed by John Sinclair and has been discussed in many studies concerning collocation, discourse and texts, multi-word units...etc. To prove the validity of these two principles in learner languages is a challenging task given the less systematic performance L2 learners may produce.
thank you very muchAthens and scholar.google.com could offer help.