What are the typical mistakes we make with these sentences? Can you spend two minutes testing yourself? By the way do you use ‘who his / who her’ instead of ‘whose’?
As you probably remember there are defining and non-defining relative clauses. Can you spend just a minute deciding? Relative clauses – defining or non-defining?
The www.freedictionary.com also offers a great explanation of relative pronouns.
An explanation in youtube:
A good page with explanations and exercises from EOI Langreo.
But there is more: exercises 1, exercises 2.
eoic1 