No, thanks David. Thank you for your kind suggestion of giving me deeper explanation.
My level of English, as you can see, is not the same level as others.
Now I know my own ability, and I don't have any high expectatiosn of myself anymore.
But I am not giving it all up. l want to learn everyday English to watch Seinfeld and read about Tom Sawyer and his gang.
I will ask more and more questions, and please keep this in your mind: any offence at all, it is not from my heart, it is just that I don't understand or can't express myself properly.