How can you make the difference between defining and non-definig clauses?
For example:
1. The restaurant where we had dinner served excellent food. (D-defining or N-non-defining)
2. Amanda, who I knew at university, was on television the other day. (D or N)
3. This book, which I borrowed from the library last week, is very interesting. (D or N)

It would be very kind of you to write explanations for every sentence.

Question

How can you make the difference between defining and non-definig clauses? 
For example: 
1. The restaurant where we had dinner served excellent food. (D-defining or N-non-defining)
2. Amanda, who I knew at university, was on television the other day. (D or N)
3. This book, which I borrowed from the library last week, is very interesting. (D or N)

It would be very kind of you to write explanations for every sentence.

Answer

So in your case all clauses are defining whereas if we remove clause the meaning will become unclear.

Answer

Defining relative clauses tell us some essential information about the things or people they refer to.They may begin with the relative pronouns who, which,that:
The picture that hangs next to Margaret's portrait is the one I like best. 
If we remove the words "that hangs next to Margaret's portrait" we do not know which picture Jasper is talking about. 
Non defining tell us some extra information. Always begin with who or which. Never omit the relative pronoun.Example:
The next painting shows Edmund's wife Margaret, who he married in 1605. 
If we remove the words "who he married in 1605" we still know who Jasper is talking about. It is Edmund's wife, Margaret.

Answers · 2

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