What did you think about/of the movie? (Merriam-Webster’s Learner’s)
Before I came across this sentence, I used to think that the complement of ‘think’ in the above is the prepositional phrase. (This leads me to think 'what's the difference from how did you think about/of the movie?' For if 'what' is an adjunct, the two adjuncts would have the similar meaning.) But Merriam-Webster dictionary’s account for its meaning: “to have an opinion about someone or something” leads me to think that it’s not the pp but ‘what’ that is the complement of ‘think’; and the pp is another/second complement or an adjunct. So the above sentence’s meaning is ‘what opinion did you have about/of/concerning the movie?’. Is my guessing proper?