The phrase "a topic that could" is correct and usable in written English.
It can be used when discussing potential subjects for discussion, research, or exploration that have the possibility of being relevant or interesting.
Example: "We should consider a topic that could spark a lively debate among the participants."
Alternatives: "a subject that might" or "an issue that could".
Whatever the answer, someone longed to speak to a topic that could not be mentioned out loud.
This week, I'll start with a topic that could save some marriages if more people made it a priority.
"This is a topic that could affect relations between Europe and the US," said the French trade minister, Nicole Bricq.
Migration is a topic that could hardly be more charged, but Rosi is no brow-beating polemicist.
But hardly a whisper has been heard about a Congressional hearing in Washington last week on a topic that could have been drawn, in all its tragic monstrosity, from the theater of the absurd.
That Mary Poppins voice "adds a sense of decorum to a topic that could otherwise be misconstrued," Tom Quaranta, the museum's director of exhibition services and operations, said in an interview.
Google any topic that could possibly come up during the campaign – there's almost no doubt Donald Trump has held at least two positions on it.
Nor did Mr. Gore mention a second topic that could have unsettled his labor audience -- his proposal to overhaul the campaign finance system.
(Now there's a blog topic that could go on for days!) With so much change, along with trying to save my financially-crippled design firm and trying to start a new online business, my life became even more unpredictable when a new guy entered the picture.
Not much is known about egg composition in dung beetles, but we suggest that this is a promising topic that could reveal hidden forms of maternal effects on the male offspring of these animals.
