Because Collocations, which is a crucial element was neglected the importance of learning English. In spite of the Collocations are used in written English up to 60-80% and is used in, say, 20-40%.
Because Collocations, which are critical elements are not neglected the importance of teaching English Collocations in spite of being used in English as much as 60-80% and 20-40% is used in speech.
Because Collocations, which is an important element is ignored and inadequate in English teaching and learning, and the Collocations. Be used in written English to 60-80% and was used in a speech 20-40%.