About "Where Is That Darn Switch"
Where:	interrogative adverb	1 in or to what place or position?
Is:	3rd person singular present	of be.
That:	demonstrative adjective	1 designating the person or thing indicated, named, understood, etc.
Darn:	adverb colloquial	= DAMN (in imprecatory sense).
Switch:	noun	1 a device for making and breaking the connection (in an electrical circuit).