The phrase 'comment on topics' is correct and usable in written English.
You can use it when you want to describe the act of offering opinions and reflections on certain topics. For example: The speaker was invited to comment on topics from the political arena.
She had a community of friends and maybe 2,000 Twitter followers, and used social media to comment on topics like makeup, movies and sports.
As stated above I prefer to comment on topics on which I have some kind of insider knowledge or professional experience and I am often disappointed that many commenters are flippant or uninformed.
As a writer, speaker and consultant, she built a big career and was the go-to source for journalists whenever they needed a comment on topics ranging from rearing polite children to what to do about gate-crashers at White House state dinners.
Since the 2006 publication of her first book on the subject, "Generation Me," which sold more than 100,000 copies, Dr. Twenge (pronounced TWANG-ee) has become something of a celebrity psychologist, appearing on the "Today" show, "Good Morning America" and MSNBC, among others, to comment on topics as varied as Facebook and the rise in plastic surgery.
In those broadcasts, and a similar show syndicated from 1961 to 1968, the bishop, an Illinois farmer's son who wrote his doctoral dissertation on Marxism, used a polished extemporaneous style to comment on topics of the day, whether movies, Broadway plays or international politics.
9 FDA policy is not to comment on topics that are currently under review.
Others will contain brief comments on topics of the moment.
The agency previously has sought public comments on topics like mortgages, payday loans and private student loans.
Other artists in "Sculpture: On and Off the Wall" have commented on topics as divergent as suburbia, identity and the writings of John Steinbeck.
I saw Rittenberg speak in Beijing yesterday, and his comments, on topics ranging from nationalism to corruption to Tibet policy, were perceptive.
He has a blog on the group's Web site, in which he comments on topics as diverse as microlending, Jesus Christ, herbal medicine and the responsibilities of public office.
