"Such as" is sometimes treated as a correlative construction, and the fact that "such" can precede "vocal structures" argues against prepositional status.

Altering the position of such vocal structures as the tongue and lips produces different sounds.

Herb

From: Assembly for the Teaching of English Grammar [mailto:[log in to unmask]] On Behalf Of Castilleja, Janet
Sent: 2009-02-20 13:22
To: [log in to unmask]
Subject: such as


In the following sentence, would you consider 'such as the tongue and lips' a prepositional phrase?  Can 'such as' function as a preposition?



Altering the position of vocal structures such as the tongue and lips produces different sounds.



Janet
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