The phrase "are capable of acting" is correct and usable in written English.
It can be used to describe someone's or something's ability to perform actions or tasks.
Example: "The new software programs are capable of acting autonomously to complete various tasks without human intervention."
Alternatives: "have the ability to act" or "are able to perform actions."
Of all the creatures on earth, only humans are capable of acting outside the laws of nature.
All we demand is that our artists are capable of acting the parts they play — in addition to sounding fantastic of course.
Researchers have demonstrated that ionizing radiation, some chemicals, and certain viruses are capable of acting as mutagens agents that can increase the rate at which mutations occur.
Ampholytic, or amphoteric, detergents, which are capable of acting either as anionic or cationic detergents in solution depending on the pH (acidity or alkalinity) of the solution.
"If the terrorists are capable of acting this way, what can we talk about?" The international community, he said, must stick together to do a better job fighting terrorism.
Former director of public prosecutions Ken Macdonald QC said that when commercial organisations are given the right to run state contracts for profit, "it is essential that they show they are capable of acting in the public interest.
Jews as a people were acted upon more often than they were capable of acting.
An effective board is capable of acting decisively in aligning the interests of those running the bank with the wider communities that they service.
The old line in the sand was between two ideologies, each held by people the other believed to be capable of acting sensibly.
One of the officials said that if France and Europe were capable of acting on their own, the United States would take them more seriously.
Peer Steinbrück, the German finance minister, said in February that if a euro-area country found itself in trouble, "we will show ourselves to be capable of acting".
