Can you know for sure how/when I've turned off the gas?

[sitifan]

1. Can you know for sure how I've turned off the gas?
2. Can you know for sure when I've turned off the gas?
In #1, the words in bold is a noun clause.
In #2, the words in bold is an adverb clause.
Is my analysis correct?

 

[jutfrank]

I see what you're doing, yes, but it's not the clearest example, in my opinion. Here's a better one.

Let me know when you're ready.
When you're ready, let me know.

Let me know what you think.
*What you think, let me know.