【正确答案】正确答案:

(2) (a) The word "down" could be seen as an adverbial, which means "from the higher position to a lower one". (b) The word "down" could be also seen as a noun, which means "the fluffy feathers forming the first plumage of a young bird".

(5) (a) " Who" could be interpreted as the direct object of the verbal group " would like" . Therefore, the answer to this question could be "I would like John to visit", (b) "Who" could also be interpreted as the direct object of the verb "visit". Thus, the answer to this question could be "I would like to visit John".
