The phrase "are not only capable" is correct and usable in written English.
It is typically used in a comparative context to indicate that something has multiple abilities or qualities, often followed by "but also" to introduce an additional point.
Example: "The new software solutions are not only capable of processing large datasets but also provide real-time analytics."
Alternatives: "are not just able" or "are not solely capable".
Pimps are not only capable of redemption, they exhibit a power and masculinity that militants lack.
"The revolutionaries are not only capable of liberating Libya, but also making sure that its wealth is well protected," he said in an interview.
Emmott's short, highly accessible and vividly illustrated book marshals compelling evidence that "entire global ecosystems are not only capable of suffering a catastrophic tipping point, but are already approaching such a transition".
For example, there are a number of watches available that are not only capable of recording people's voices, they can also capture video footage and photographs via a tiny camera cleverly fitted into the inner workings of the watch.
Let's show that democratic nations are not only capable of sending bombs in international response, but capable too of welcoming millions of new citizens and working together with them.
I have long thought that children as young as three or four are not only capable of enjoying stories that cover meaningful issues, but are actually eager for them as long as it is done in a funny, enjoyable way.
SAW were not only capable of making fantastic records, they could make them in more than one way.
Since then, scientists have been finding more evidence that the human brain is not only capable of renewing itself but that exercise speeds the process.
"Apple, as a design leader, is not only capable of doing this, they have a responsibility for doing it," he said.
Garrett ignited something with a no-nonsense style, but he will have to prove that he is not only capable of pushing players into uncomfortable places, but also pushing back at Jones.
The proposed method is not only capable of suppressing noise but also recovering structural details.
