Here's the SAT sentence that raised my curiosity:
Strong wind, sweeping almost unchecked over great distances, is a prime component of the grassland climate.
Although I know the sentence above is indeed the standard way of expression, I am wondering why shouldn't "unchecked" be replaced by an adverb.
I have done some research and someone suggested that "unchecked" is acting as a complement. If he is right, would anyone please indicate which kind of complement it belongs to and when it is correct to use as above?
I also found this on the Internet. According to The Guide to Grammar and Writing:
When the participle of an absolute phrase is a form of to be, such as being or having been, the participle is often left out but understood.
Does this help explain my sentence?
Thanks in advance. (I am not a native speaker so please forgive me for possible grammar mistakes in this post.)