Why we can’t Speak Fluent English?

As we are not native speakers we face a lot of problems during speaking. Even those people who are good at English can’t speak as good as they write. Now, what is the problem with them?? 
We read, write and study in English At least 12 or more years. Then what is the problem???
Is someone’s overall knowledge very good but struggles to speak fluent and sometimes gets Stuck for words in the middle of conversation?
It may be like that he/she is suffering from the so-called “Writing Mode” syndrome. That means, he/she is spending time learning grammar & filling the gaps in the text books for a long time and thus the brain gets used to constructing sentences by picking write English words and arranging them according to grammar rules.
It works great when having an exam or written tests. But in case of speaking with real people it also works on that “Writing Mode” ;) & it can’t keep up with the speed of natural conversation.
To solve this,,,
‪#‎First_of_all‬, we need to realize spoken English is consist of word combinations instead of single words! There are certain word combinations are used by Native English Speakers & if we memorize them we’ll be able to use it more effectively without much thinking just like the Native Speakers do. It’s a simple trick. Just learn the basic grammar and do focus on building Phraseology. No need to spend more time by learning grammar because those natural speech patterns include all necessary grammar in them.
‪#‎Secondly‬- we need to dedicate most of our time to spoken English practice. It’s quiet impossible to learn spoken English by reading a lot of it. We need to train our mouth to do speaking the same way we train our body to the GYM.
So, Here a saying goes well, “Practice makes a man perfect.” It will be great fun and in the mean time you will be able to speak well and we all too. Isn’t it a good Idea??