Again, 'where' is an adverb. In non-defining relative clauses, only 'that' can be omitted except when it is the subject of the clause: The house (that) I live in The house that fell down
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imantaghaviin my book(FCE Gold, Longman) the followings have been listed as relative pronouns:who,which,that,whose,when,where,whySome books do call all relative words pronouns. But that's not strictly correct. For example, "when", "where", and "why" are not pronouns; they are traditionally called adverbs. They are relative adverbs when used in relative clause
imantaghaviWould you please provide me with an example of non-defining relative clause where "that" used as the subject of the clause?It is NOT possible for "that" to be the subject (or anything else) in a non-defining relative clause. "That" can only be used in defining relatives. I think MM made that clear.