Is this sentence correct Who does this pen belong to?

The four cases

 

In this way, familiar with the mutability of nouns, which is different depending on the gender of the noun, we asked about the quality of the different cases:

1st case: What do we ask when we ask a who question?
I asked a lot of who-questions and pointed to objects or people in the classroom: Who is that? The Johann. Who or what is that? The window. Who or what is that? The door. It quickly became clear:
With the question "Who (or what) is that?" we ask for the name. We call this case the name case.

2nd case: What do we ask when we ask whose question?
I asked a lot of Whose questions and also pointed to things in the classroom: Whose backrest is that? The back of the chair. Whose handle is this? The handle of the window. Whose guitar is that? The teacher's guitar. The students noticed that we were asking about something that belongs to something or someone. To refer to the name "Stammfall" suggested by Dühnfort, I asked a student: "Whose son are you?" He replied, "My parents' son." I further asked: "Whose grandson are you?" "My grandparents' grandson." Ah, so this is about parentage.
With the question "Whose?" we ask what part belongs to something or someone. We call this case the parent case.

3rd case: In order to investigate the quality of the Whom case, we have to refer to the Verbs watch. 
Who does the satchel belong to? Who do you give your notebook to? Who do you owe this to Who are you taking the jacket from? Who is Anna writing a letter to? Who are you following Who do you shake hands with in greeting? Together we collected examples. I wrote the related ones Verbs on the blackboard.

4th case: We proceeded in the same way with the who questions:
Who (or what) are we working on in the magazine? Who (or what) does the sweeping service sweep after class ends? Who (or what) does the Plant Service water daily? Who do you visit on the weekend? Whom does he ask for help? Who (or what) are you kicking into the goal? Who (or what) is the bricklayer building?

When comparing the two verb collections, some students succeeded in perceiving a qualitative difference: the verbs of the who questions often have to do with interaction, the verbs of the who questions often with practical activity. This is how we arrived at the terms proposed by Dühnfort:

With the question "Whom (or what)?" we often ask what happens between people or things. We call this case the give and take case.

With the question "Who (or what)?" we often ask something that has to do with being practical. We call it the causing case.

In this way, we have given the four cases names that correspond to their different qualities that have become comprehensible to us. In this way, the abstract and complex topic of the four cases, which for many people was abstract, became tangible and manageable for the students. Which subtleties of linguistic expression are reflected in the grammar of a language or which nuances the grammatically correct use of language enables, remained unspoken, but certainly an impressive experience for most of the students.

The terms listed here for the four cases correspond almost exactly to the Latin terms nominative, genitive and dative. In the accusative case, there was already an inaccuracy in the translation from Greek into Latin, so the Caused to accusation has been.