Imagine speaking English automatically... without thinking. The words come out of your mouth easily, and fast. You understand instantly.
To do this, you must change the way you study English. One easy thing to do is to stop studying English words. What?
Stop studying English words.
That's right, do not memorize words. Native speakers do not learn English by remembering single words. Native speakers learn phrases.
Phrases are GROUPS of words that naturally go together. In fact, when you learn phrases you learn both vocabulary and grammar-- easily and automatically.