German, please see the next sentence. Thank you.

The answers to your questions are as follows:

This is the lyrics of a song. Please see if my translation is accurate. See also the question in brackets: The title of the song: The Death of McKee Messer. (1) Lyrics about McKee Messer sung by street performers: Und der Haifisch, Derhat zaehne. The traveler is there. And Macheath, he's a messenger. This is my favorite. This shark has teeth. He wears all his teeth on his face (that is, he has teeth on his face) (I think Macheath is compared to a shark here). Macheath has a knife, but people can't see it.

1. The title can be translated into "McKee's Song of Knife"; It can be understood this way.

Ah, this is Hefsen's. Rot, when this person cries. Mackey Messer danced and danced. Drauf people can't be the smartest.

Ah, this is shark fin. (des Haifischs Flossen pushes Flossen's second grid des Haifischs. Why? I have never seen this usage. Can the lyrics be written more freely? )。 When a shark (diesel refers to a shark, right, but diesel is used alone, omitting Haifisch, it should be dieser Haifisch, right) splashes blood, it is red. Mackey Messer wears a pair of gloves, so people can't see his crime.

2. Hafez's second case should be advanced here because of the need of poetic rhythm; Yes; Yes; McKee Messer should be "McKee's knife" here; It can be understood this way.

A green bottle. Corrupt Poles. Cholera is a terrible disease. The robbery is like this.

On the green surface of the Thames, someone suddenly fell down, neither plague nor cholera. However, this should be: related to March. (or it has something to do with Macheath coming out to make trouble)

Please note that umgehen should be unDerstood as "appearing and causing trouble" rather than "about", for example: der Esther Gekht um.

My name is Sonntag. A man is on the beach. A man died. Danman McKee, Messer Nent.

On a very good blue Sunday (I think blau here describes blue sky and sunny weather, right? )。 There is a dead man lying on the beach. A man named McKee Messer came to the corner.

4. Yes, it can be understood like this; Mackey Messer should be the "Mackey's Knife" here.