In my opinion, the main cause why the ability to speak English is difficult to increase only 4.

Causes Increase Hard English Ability:
Cause the first is the habit of the Indonesian language ugly. If we say or write, in general we like to spin (not to the point), plus an unstructured, so often we do not know where the main subject, main verb, and so on.
The second reason is when using the English language, either via speaking and writing, we usually partition the brain into 2, namely the partition A partition for the Indonesian language and B for the English language. First of all sentences are made first in the partition A, then exported to partition B to translated before finally expressed through speaking or writing. The effect is a pattern or grammar that has been hard-earned studied since junior high school to be forgotten because of the partition B is too busy translate verbatim made in partition of A. And, because the Indonesian language sentence unstructured, partition B to be added headache of doing the translation. As a result, the partition B often hangs (freezes), and no output is generated. If any partition B managed to output, output is generally far below the standard, the bad English. In addition, the other person is asleep usually eaten by mosquitoes because eventually wait.
The third cause of inconsistent motivation. For students, the motivation to learn English in general because they want to get good grades. That is, the time to learn English just want to test, and after the exam finished his book was to settle somewhere.
The third is learning English method is less precise. If you just rely on the power memorized, your Home will from not get better.