I'm concerned and I'm sure you'll understand my message or newsletter is. , Both you and my understanding is that I can actually read and write English a little.
I am worried and not sure whether you will understand my message or letter. Well, you and I understand the match really is, I can read and write a little in English.
I don't worry about and make sure that you will understand my message, or letter of how much, both of you and I can understand. Or, actually, I can read and write in English. Just a little.