Can you give some help, please? According to the exercise, I have to combine the two sentences with a relative pronoun.
- A car didn't stop at the crossoroads. It was going fast.
A car, which was going fast, didn't stop at the crossoroads.
- The girls laughed during the film. They were sitting behind me.
The girls who were sitting behind me laughed during the film.
- The boy plays tennis very well. His brother is a tennis instructor.
The boy whose brother is a tennis player plays tennis very well.
Do you agree? There is no context given and sometimes it is hard to distinguish defining from non-defining relative clauses! Maybe both options are acceptable. Thanks a lot beforehand!