If you start with the singular, continue with the same. 'The thing' and 'concern' are both singular, so go with "is".
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AnonymousI have a question concerning following sentences:If the subject is singular, the verb has to be singular as well. In both of these se
The thing that particularly catches my attention is/are the eyes of the woman who is having her photo taken.
My biggest concern is/are my children.
I think 'is' is the correct answer...i am not sure, though