Re: Voice Control on Mac:
Re: Is there anyway to get the voice control to actually do what you tells it to do?
You may want to view how to: Get started with Voice Control on Mac - Apple Support
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Re: how is it supposed to be used?
Apple support's online article: Use Voice Control commands to interact with your Mac - Apple Support
says:
"You can speak commands to navigate the desktop and apps, interact with what’s on the screen, dictate and edit text, and more". Many "how to" details are in the above article.
and /or
Apple provides a "YouTube" video showing how to use Voice Control:
https://www.youtube.com/watch?v=eg22JaZWAgs
More Voice Control info: See: Use a custom vocabulary with Voice Control on Mac - Apple Support
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Re: "I would expect: "Show me the weather forecast for tomorrow." would give me some examples from web pages or so.
Apart from Voice Control: Apple provides.direct access to "Siri" to answer general questions like weather, once activated (by voice or button press), Siri replies with a spoken voice response or with text examples (sometimes both) depending on your settings.
See how to: Use Siri on Mac - Apple Support.
Eg says:
Turn on Siri
- On your Mac, choose Apple menu
> System Settings, then click Siri 
in the sidebar. (You may need to scroll down.) - Turn on Siri if it’s not already on, then click Enable.
If you try to activate Siri when the option isn’t selected, you’re prompted to enable Siri.
You must be connected to the internet to use Siri.
You can choose: Siri settings on Mac - Apple Support
Eg above article says:
Select a preferred voice for Siri from the Voice Variety options and the Siri Voice options.
Some languages may only have one option.
Siri Settings can. be customized using your choices.
Customize Siri on Mac - Apple Support
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Re: How should the questions be phrased?
To begin with: say: "Hey Siri, (or just "Siri") what is the weather forecast for [your city, country]
or, if you wish, you can press a button to activate Siri, and type your request quietly.
More "Siri" info: How to use Siri on your Mac - Apple Support
All the best :-)
