hello
i read in a book that the difference between defining and non defining is the preposition :
in the defining the preposition is at the end of the clause foe example :
The house I used to live in is very old .
in the non defining the preposition is at the beginning of the clause for example :
London Secondary School,to which I went when I was younger, is one of the biggest schools in the country .
Is this correct or not ? Is there any other differences between defining and non-defining .
PLEASE tell me .Thanks in advance .