he
The German word 'er' is used as a personal pronoun for males. It can be used to refer to a specific male individual, a group of males, or any male being in general. It is equivalent to the English word 'he'.
He goes to the cinema.
This sentence uses 'er' in the subject form to represent 'he'. In this context, 'er' is going to the cinema.
He has a dog.
In this sentence, 'er' also stands for 'he'. The phrase indicates that 'he' has a dog as his pet.
He loves music.
This sentence is using 'er' to mean 'he'. The phrase reflects that 'he' has a love for music.