The phrase "appear to be ailing" is correct and usable in written English.
It can be used when describing someone or something that seems to be suffering from illness or decline.
Example: "The once vibrant garden now appears to be ailing, with wilting flowers and brown leaves."
Alternatives: "seem to be unwell" or "look to be struggling".
He had given up his service-break advantage in the fifth set and appeared to be ailing when he called for a trainer while facing two break points.
But one medical witness has said it was impossible to tell if he was concussed before he collapsed and another said he was only sure towards the end of the game when Mrs Walton shouted across to her son in concern because he appeared to be ailing and confused.
The statement indicates that the plans of the chief executive, Kate Swann, to turn the once ailing business around appear to be working.
Whisper it quietly but they appear to be following the English model, which is to go to southern Africa in search of a coach to resuscitate an ailing national team.
The movie also is the final film of Marcello Mastroianni, who completed it shortly before his death and appears to be seriously ailing on the screen.
But Mr Tantawi, now 78 years old, is believed to be ailing and soon to retire.
One contemporary commentator remarked that "Mr. Lambert scarcely knows what it is to be ailing or indisposed".
As for Hixon, there appears to be some confusion about what is ailing him.
He was only speaking generally, but after a recent stretch in which a frustrated and irritated Anthony appeared to be an example of what was ailing the slumping Knicks rather than being their prized solution, Rivers's point seemed apropos.
Kirk Kerkorian thinks he'll do better in Las Vegas than he did in Detroit; the billionaire investor appears to be taking money out of ailing auto giant General Motors and putting it into MGM Mirage.
