I found it quite impressive that people are capable of this. For me, I have neither energy, nor ability, nor comprehensive knowledge to do so. So, it is always fascinating (and a bit intimidating) to see people writing these all the time. I want to ask how you guys achieve this feat.
Maybe, is it that I am nonverbal so I cannit write coherently?
Read a lot, cite sources and explain thouroughly what you think.
I mostly use the last method. Basically, you want to make sure that the other person understands fully what you mean. You can use examples and anecdotes as well.
Training yourself in philosophy also helps, as it makes sure you argument well what you want to say.