In teaching a foreign language the hardest thing is to give feedback during speaking exercise.
If I don't want to disturb the thought process of my clients, their sentence making, their grammar and vocabulary choices, in order to express their opinions or answer a question - I must not interrupt them!
It took me years to find the most appropriate exercises to give them speaking feedback and one of them is exercise that I call SEE YOUR SPEECH.
The student talks while I write everything exactly the way they talk, with all the pronunciation mistakes, wrong grammar or vocabulary choices. After that, we analyze their speech together!