(1a) John, a Grade 7 student, seems to try harder and spend more time on his homework. (my version)
I think "spend" is correct because it modifies "seems". That means, in a longer form,
John, a Grade 7 student, seems to try harder and he seems to spend more time on his homework.
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(1b) John, a Grade 7 student, seems to try harder and spends more time on his homework. (my friends' version).
They think "spends" is correct because it modifies "John". In a longer form,
John, a Grade 7 student, seems to try harder and he spends more time on his homework.
Which one is correct: (1a) or (1b)? Thank you for your help.