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I'm currently studying a CELTA and need some help with a lesson I'm teaching on Monday. I was wondering if some could help me with the following:

These questions are from "Cutting Edge: Upper Intermediate (p.36)".

In these dialogues, the students need to choose the best verb form and answer why. Choosing the best verb form is simple enough but can anybody help me as to why they're the best verb form to use?(Number 3 is causing me most problems) Any concept-checking questions or timelines to clarify will be much appreciated.

1. So how are you anyway? Done anything exciting since I last saw you?

No, nothing at all. It's rained / It's been raining all weekend. I haven't been / I haven't been going out once!

2. I'll phone you tonight to discuss the details, say about eight o'clock?

Could you make it a bit later? We'll have / We'll be having dinner at that time.

3. Excuse me, is it going to be much longer? I've waited / I've been waiting for over an hour!

I'm sorry, the computer's broken down / been breaking down and we've lost / we've been losing all our records. Dr Greenway will see you as soon as he can.

4. Put the camera down please, you'll break it / you'll be breaking it.

No, I won't!

1. So how are you anyway? Done anything exciting since I last saw you?

No, nothing at all. It's rained all weekend. I haven't been out once!

Because the actions in these sentences are completed. Perfect Continuous is used for actions continuing at the time of speaking.

2. I'll phone you tonight to discuss the details, say about eight o'clock?

Could you make it a bit later? We'll be having dinner at that time.

Because the action here will continue at the mentioned time

3. Excuse me, is it going to be much longer? I've been waiting for over an hour!
Because the action is continuing at the time of speaking

I'm sorry, the computer's broken down and we've lost all our records. Dr Greenway will see you as soon as he can.

because the actions here finished they are not continuing

4. Put the camera down please, you'll break it .

the speaker talks about an event that will happen in near future. But the action of breaking will not continue it will just happen. No matter how long it lasts The important thing is the action not process

right
It had been raining all weekend ( could be) but on this sentece it has been rained.