How I came to realize that my Chinese isn't so good anymore

I guess I can't say that my Chinese is ever good, nor can I say the same with my English.
I'm in the middle. I don't have perfect English but I don't have perfect Chinese either.

It was not until I went back to Taiwan last summer, and took up a job at my dad's office that I realized how bad my Chinese really was.

My cousin was preparing for the meeting and asked me to write some of the topics onto the board.
He was sitting and reading off from his list. And I couldn't write out the characters.
I don't remember how to write them anymore. And I would ask him how to write a certain word so often that he decided to just write it himself.(perhaps one every other word)

I haven't been using Chinese for a while, I chat to my friends in Taiwan using Chinese.
But when I have to write it, I don't remember how . I just don't. I have to think hard.
Then I wirte it out , and it could still be wrong.

Hopefully it'll come back to me after I move back to Taiwan..