02br 02br 01font 00John who took my pen is here. -- Would you say since 'who' is the subject of the subordinate clause 'who took my pen'01b 00, 00Yes02b 00 00 'wjho' has to be there? 01b 00Yes02b 00 00How would you know 'who' is the subject?
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John is here - main clause
who took my pen - subordinate clause
'who' is a dummy subject
John is here - main clause
who is wearing my jacket - subordinate clause
'who' is the dummy subject
anonymousJohn, who took my pen, is here.
John, who is wearing my jacket, is here.
These are non-defining relative clauses.
Once you have established the referent for "John" no