Collocation? or Structure?

As a non-native speaker of English, it has been my goal to figure out the best approach to master speaking/writing/reading/listening skills in English. Different people have different ways in relation with learning a second language based on their personality, interests, motivation, or background knowledge. For this reason, it seems waste of time to discuss which way is best or not. Nevertheless, it'd be worthwhile to think about the benefit coming from learning collocation and different structures in English, for most of Korean publishers seem to be big fans of learning collocations while there might be ignorance of teaching how to form basic English structures that are totally different from Korean language.

Back in Korea, the books I ran into at bookstores were mostly about collocations or expressions. I love those books in that collocations make my English more understandable and native-like. Furthermore, using collocations saves my time and efforts that otherwise I should spend more to make my sentences understood by putting more words. Due to the benefits that collocations bring to our English, there are big defaults dealing with collocations. First of all, we should know the roles of collocations are restricted to parts of speech that have limited functions within whole sentence structures. What more necessary seems to get sense how to put those parts of speech quickly and automatically in a sentence. Second of all, most Korean English learners fall short of finding chances to use collocation they memorize. since Korean language does not furnish us with something like collocation in English,