I don't know

I don't know anything sometimes.
I don't know how to say.
I don't know how to understand somethings.
Mabye the teacher speak too quickly.Mabye I can't hear well.
Mabye...
I don't know a lot of words.
I ask "What does it mean?"
I think this sentence is the most sentences what I said.
I don't know what could I say or write.
I don't know a lot fo countries'name .
Of course,I don't know how to speak name of them IF they are frow other country
Only a bit countries I know how to speak.
I don't know lots of members of the world including something from China.
I only want to improve my English.
I need to speak English well before the O level course.
I need it!Just do it now!
To be or not to be ! that's a question!
But I think it is not a question .I can answer. I need to be.....