Panadbois I just looked up dychryn in the dictionary and it said "terrify, horrify". If I understand your sentence correctly, it says "I'm horrified at how quickly alex is learning the language, incredible"?
I suppose it does seem that way, but really, all I am doing is using what the rest of you are using in your posts, plus a few words I've either learned from Say Something in Welsh or looked up in the dictionary. I don't even know the personal pronouns like he and she and they yet, all I've got so far is i/fi, ti, chi. All the seemingly advanced structures I've used are from other people's posts on here. As I said before, I make notes from what I read and then try to use it myself. (for example, from one post yesterday I wrote "blino=tired. blinedig=tiring. -edig=adjectival ending? I shall keep an eye out for -edig and try to apply it myself when I've seen how it works.)
This means, of course, that I will be copying any mistakes too, but I hope to work it out as I learn more. From my previous language learning experience, I've found the best thing to do is use it as much as possible. There's no point in me writing down "mae rhaid i= I have to" and then leaving it there and forgetting about it, I have to use it in order for it to stay in the mind.
It may seem incredible, but really it's just careful observation, a willingness to try (I don't worry about making mistakes) and a lot of dedication and enthusiasm 