I donīt understand the difference between Defining and Non-defining clauses.when I use and what I use to do Non-defining relative. I have some examples about :
All the teenagers who/that you interviewed yesterday think newspapers are obsolete.
Jeremy,who has just turned 16,never reads the newspaper.
Your second example is clearly non-defining. The adj. cl. does not tell us which Jeremy.
Your first example is more complicated. The way it is written (as a defining clause) means only the teenagers that you interviewed think newspapers are obsolete. Other teenagers don't necessarily agree. The adjective clause answers the question "Which teenagers?"
The sentence could be rewritten to mean that all teenagers agree: Teenagers, some of whom I interviewed yesterday, think newspapers are obsolete.
** "Teenagers, who I interviewed yesterday, think newspapers are obsolete" is illogical as it suggests that you interviewed all teenagers in the world.
Hope this helps.
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