Yes, I think too! And then? English or Dutch?

I speak Dutch verry good. I would like to learn English. Pherhaps we can chat with each other and can correct each other. . .

I hope you are intressed!

Iris

Wat doet hij in het park

I have some questions about the sentence below

1:A Waar is LiMing naar toe gegaan?

Hij is nog steeds in het park. = He is still in the park.

2:B Hij is naar het park gegaan.
3:A Wat doet hij in het park?
4:B Hij is daar een boek aan het lezen. 

Lezen = reading (verb)
He is reading now. Therefor you write it in the present tense

QUESTIONS
Q1 in (3), How can I get implication that LiMing is still in the park? or I cannot get it ONLY according to the two sentences above.
Q2 in (4) Is the “lezen” a noun or a verb?
Q3 if it is a verb, why "is ... lezen" is used here, to answer a present tense "wat doet"？
Q4 if it is a noun, does it need an article?

Ik weet niet of je hier iets aan hebt. = I don't know if you  have something about it.

I speak Dutch verry good. I would like to learn English. Pherhaps we can chat with each other and can correct each other. . .

I hope you are intressed!

Iris

Ik werk op in Nederlands!

Meer op over mij: Ik ben Jeff, en Iik leefv in Amerika! Kan je me met Nederlands helpen? Dank jullie wel!