ERROR,C++,data structures,teaching myself,setback?

[yichi]

I am teaching myself C++ & data structures these days, and now I encountered a UNBELIEVABLE setback!
I have been busy solving it right now and I feel exhausted.

Please take your time and check my code, it's an unbelieve error.

"class List" is inherited from base class "ablist".

I wondered why accessing "pHead""length" etc; is forbidden in class list, even they are inherited from "ablist"?
I hve to use "ablist <type>:Head" to access to pHead.

//*************************//
//ListNode
//*************************//

template <class type>
class ListNode
{
public:
ListNode();
type data;
ListNode <type>* pNext;
};

//Fuction(){codes..}..

//*************************//
//ablist
//*************************//

template <class type>
class ablist
{
public:
ListNode <type> *pHead;
ListNode <type> *pCurrent;
ListNode <type> *pTail;
int length;
//Fuction(){codes..}..
};
//Fuction(){codes..}..
//***********
template <class type>
class Listublic ablist <type>{
public:
List(){
pHead = new ListNode <type>; //ERROR occured here

//If I didn't use "ablist <type>:Head" , this piece of code won't compile correctly

ablist <type>::length=0; //it works
}
~List(){
ablist <type>::MakeEmpty(); //OK
delete pHead; //forbidden
}
};
//Fuction(){codes..}..

//end


What can I say to express my feelings towards your help?

//I come from China, please feel free to contact me and correct my mistake if you find anything wrong/not idiomatic in my English usage.