The discrepancy between writing and speaking
I've been thinking about this for a very long time, it's more than six months trying to figure out why the words just aren't coming when I start speaking.
Firstly, I was thinking that the writing is not enough coherently so my mind is still struggling when it comes to any form of talking in english. And I was right. So I've started to read books only in English.
The second thought was that I didn't listened a lot of speeches in english. Well, I think that this was the most useful thought about my problem. I started listening to english music(even if my music preferences doesn't include too much speech), I've watched movies more frequently using only english subtitles. even tried to listen to some english podcasts and conferences.