Yes, patient is the subject. However, look at that Passive Verb site I gave you. "returned" is only part of the verb.
examination is the noun subject. Physical is an adjective describing the subject.
The verb is correct.
re-posting answers to questions...
The patient was returned to the recovery room in good condition. verb = returned , subject patient
Physical examination showed marked irritability. physical examination = subject
verb = showed,
2 answers
1. You keep forgetting helping verbs: is, are, was, were, have, had, has -- the most common helping verbs. Do you see the helping verb in this sentence?
2. The simple subject is examination. "Physical" is an adjective modifying "examination."
2. The simple subject is examination. "Physical" is an adjective modifying "examination."