大家好，请问一下
想厘清seem/appear (to be)的用法，看到牛津英语用法指南PEU是这样写的：
条目507.3 seem
"Seem to be" is normal before noun phrases.
I looked through the binoculars: it "seemed to be" some sort of large rat.
(NOT ... it seemed some sort of large rat.)
I spoke to a man who "seemed to be" the boss. (NOT ... who seemed the boss.)
However, "to be" can be dropped before noun phrases which express more
subjective feelings.
She "seems (to be) " a nice girl.
The cup "seemed" almost doll's size in his hands.
It "seems" a pity, but I can't see you this weekend. (NOT It seems to be a
pity ... )
以上是书中内容，但我觉得这有模糊地带，
例如I spoke to a man who "seemed to be" the boss.难道就不能这是我的“主观”
感受而写成who seemed the boss？
总之，这解释似乎会有自由心证的部分？
请教一下。谢谢！
原文http://i.imgur.com/FSVuDe5.jpg

会不会是她是不是好女孩，答案每个人的主观判断不同；但他是不是老板，却有一个客观的答案存在，不因主观判断而改变

原文不就写了the difference is not always clear-cut,and both are often possible.

seem情态内涵也有分主观、客观意义，前者是说话者自己随意添加如感觉，后者是说话者脑补他人意见如据信（+be判断）

感谢回应！