Why is this sentence correct? Why is the subject "students" or "they" omitted in "as did just a decade ago"? Can someone shed light on this peculiar construction and point to an online resource that gives a clear explanation?
"Only half as many students study computer science as did just a decade ago."
Top answer
Think of it as a shorter way of saying 'Only half as many students (do) study computer science as did (study computer science) just a decade ago'.
— Rover_KE
Think of it as a shorter way of saying 'Only half as many students (do) study computer science as did (study computer science) just a decade ago'.
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Thanks so much for enlightening me about this sentence construction. Is there a name to this sentence construction so that I can look it up online for more details?