I know a number of Chinese friends who spoke Chinglish when they first arrived the North American countries in 1990s.
Because they learned English from their Chinese English teachers. They did not have experience to practice the English and did not know how to use it properly.
English immersion programs become very popular in China now. Students going to the programs have to use what they learn, because they have native speakers to talk to.
Learning if good, but enough. You have to use it.
Having insights are good. You have to test them and apply them to your action and life.
Learning by doing is a better way to master, develop what you.
WE-FIVE 