Sentence Diagramming Exercise

Test your sentence diagramming skills as Yossarian the Grammarian walks you through the way to diagram "I know what I did might seem strange."

[holdenru]

Where can I read more about this system of the diagramming sentences?
This is a standard system or you developed it yourself?
It seems that this system is very useful.

[acb]

I think the direct object is "what might seem strange."

[suzaneringoringo]

Sir, would you please make a video of how to diagram a causative?
Example: My parents make me do this.
Or maybe this (I don't know if it is causative or not): Please let me go.