" Is it redundant or wrong to add back the words in brackets? No, it's fine. Also, can a verb be followed by a past participle?
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(1)"The person (who is) seated in front of me keeps turning back."This kind of relative-clause contraction is called "WHIZ deletion" in a grammatical term. "WHIZ deletion" is very common in English, and many of words or phrases modifying a noun from behind can be