A simple clue to teach the difference between the Present Perfect and Perfect Con

[Canerbilgin2003]

If you can say "can't you see I am doing?", it is Perfect cont. Tense.

Example: I .................(spend) my life in London for five years.
Can we say "Can't you see I am spending?"
No.
Because we cannot understand that he has been spending his time there for five years from the situation. We should feel or see the the evidence that the action is still happining .
An ordinary person from another city may have said this.

Example:I ...............(digging ) the garden for five hours.

Can we say "can't you see I am doing it?"?
Yes,because we can either see or feel that he is doing it now.
He may be sweating or digging, etc.

[Lost_Soul]

what did you rite that for? whats your question?

[Canerbilgin2003]

To give information to the fresh teachers.Do you always expect a question?