Regina, Saskatchewan; Canada
The "Invisible Whom" made me think of another word that often plays the ghost, the preposition to. There are two main examples of the invisible to: the Dative and the Infinitive.
The Invisible Dative to is found with expressions of something being given to someone or something. This may show up with any example of using the word give.
He gives her a rose = He gives to her a rose
It is also used with some other words: told (to) her the story, showed (to) her the picture, etc.
The invisible dative to is also used in some special phrases.
Me thinks = to me (it) seems
Me liketh = to me (it) is pleasing
Woe is me = Woe is to me
This kind of expression used to be a way to express having something as well. In Greek and Latin and even Hebrew one may say "Me is the name John = to me is the name John", and it expresses "My name is John", or "Me are two sons = to me are two sons" and it expresses "I have two sons".
There are many places where the infinitive is there, but the familiar "to" that we usually expect is unseen.
This shows up whenever will, shall, may, can, do are used with other verbs. To recognize the invisible to of the infinitive use the more original meanings "wish to" for will, "ought to" for shall, "be able to" for may, "know how to" for can, and "make (oneself) to", for do.
I will go = I wish to go
I shall go = I ought to go
I may go = I am able to go
I can go = I know how to go
I do go = I make myself to go
The other main example is with the words saw, make, bid, let, and others that behave in a similar way. Thinking of other verbs that use the "to" may help understand why the infinitive is used, "force to" for make, "ask/command to" for bid, etc.
I saw him go = I saw him to go
I make him go = I make him to go (...force him to...)
I bid him go = I bid him to go (...ask/command him to...)
I let him go = I let him to go (...allow him to...)
The word dare may be used either way: dare do or dare to do. Therefore, from Middle English there is the expression derring-do, derring being an old spelling for "daring".. Even though this is treated as a noun in the dictionary, it is actually an expression using the infinitive: derring do = derring to do.