when-clause and if-clause

My question is: can a “when-clause” or an “if-clause” be subject/object of sentences like these:
I admit when you help me.
When you help me is admitted by me.
I appreciate when you help me.
When you help me is appreciated.
The problem is when you do not help me
When you do not help me is the problem.
The problem is if you do not help me.
If you do not help me is the problem.
If so, can I use the “it” as preparatory object? Ex. It is the problem when you do not help me. It is admitted by me when you help me.

Or are these to be considered as “temporal clauses” and “conditional clauses” only? If so, I should write: I admit it when you help me and The problem will be (arise) if you do not help me and I appreciate it when you help me.
And in addition, I should have the possibility to invert them and add a “comma”:
When you help me, I appreciate it.
When you do not help me, the problem will be.
If you do not help me, the problem will be.

I have a lot of confusion about the noun clauses. Could you kindly help me? Thanks!