Present Perfect Tense + Past Tense

I have known Ali for a very long time - we have been friends since our first day at school, thirty two years ago. He came around to see me last night to ask for my advice.

Conversation

How do you start your conversation?

Start with;

What
Who
When
Where
Why
How

What do you want?
Who is important?
When the event is taking place?
Where do you begin?
Why do you make such a fuss?
How do you know?

I have been waiting for you

Present Perfect Continuous Tense

Subject + have/has + verb + ing

We have been discussing the problem since last year.
He has been complaining about the poor service for the past few days.