quote:
"Our careers are turning to a new chapter."
This sentence is fine. 'A new chapter' can refer to everyone's careers; it's a common phrase that means new and different things will be happening.
Since 'a new chapter' is a fixed phrase, it would probably retain its singular form even though it refers to many people. See this previous posting on the distributive plural:
http://thegrammarexchange.info...24&a=tpc&f=340600179_______
(2) Our careers are turning to new chapters.
(3) Our careers are turning to a new chapter respectively.
(4) Our careers are turning to a respective new chapter.
The sentences above are not right.
In 2)'A new chapter' is preferable to 'new chapters,' as discussed.
In 3), you can't say 'respectively' unless you have individual subjects. So you could say, 'Each of us -- Bob, Tom, and Sara -- is turning to a new career: medicine, law, and business respectively.'
Sentence 4) doesn't work with 'respective.' It's OK as 'Our careers are turning to a new chapter.'