Is this German sentence gramatically correct or incorrect In dem Haus Friedrich tanzt?

The sentence "In dem Haus Friedrich tanzt" is grammatically incorrect. While the individual words are correct, the sentence structure is flawed. It's missing a verb that connects "Friedrich" to the action of dancing in the house.

A correct version would be:

* Friedrich tanzt in dem Haus. (Friedrich dances in the house.) This is the most natural and common way to say it.

Other correct options, though less common, include:

* In dem Haus ist Friedrich am Tanzen. (In the house, Friedrich is dancing.) This uses the progressive form.

The original sentence tries to imply "Friedrich dances in the house" but fails to explicitly state it.