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08:07
@user178049 So we can omit "who is" in both cases?
Since I noticed "Non-restrictive relative clauses can be reduced in one way." from writingcenter.unc.edu/relative-clauses
That means you cant omit "who is" in the relative clause that adds additional information which is not important for identifying the person.
I don't know I'm not a native, but that's from what I have read. Do you have any advice for me?
And what if we can literally omit "who is" from the Clare sentence. Would it be with commas or without any commas?
"Clare, sleeping in the couch, is Mike's son"
"Clare sleeping in the couch is Mike's son"
@user178049 By the way, omitting "who is" in such a sentence "James, who is a doctor, is my friend" is fine, because the verb "is" is a "be" verb (not a verb-to-be).
"James, a doctor, is my friend"
How about "Clare, who is sleeping in the couch, is Mike's son"?
 
4 hours later…
11:52
"James, a doctor, is my friend" — 'a doctor' is not a relative clause but an appositive noun phrase.
I i think it's acceptable to say "Clare, sleeping in the couch, is Mike's son". Some may not agree though.
"The stained-glass windows, illustrating biblical scenes, are splendid"—This is taken from, English Grammar: A University Course* (Downing, 2006)
I'm not user if I should mention you with the "at". Does this ping @hbtpoprock?
 
1 hour later…
13:06
@user178049 Yes, it does. Thanks for the information :)
As you stated, it’s acceptable :) grammarbook.com/punctuation/commas.asp
Rule 5. Use commas to set off nonessential words, clauses, and phrases (see Who, That, Which, Rule 2b).

Incorrect: Jill who is my sister shut the door.
Correct: Jill, who is my sister, shut the door.

Incorrect: The man knowing it was late hurried home.
Correct: The man, knowing it was late, hurried home.
The last instance is similar to our case
13:49
It seems more I know more complex it becomes LOL

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