"have doubts on" is correct and usable in written English.
You can use it to indicate that you are unsure about something. For example: I have doubts on whether this solution will actually work.
Yet one may have doubts on first encountering Bedouins wearing black robes and herding black goats.
It seems likely that the present inhabitants of the Sinai, the Bedouins, would have optimised their solutions for desert survival during their long tenure in this desert Yet, one may have doubts on first encountering Bedouins wearing black robes and herding black goats.
In the briefing Saturday, Pakistani officials said that the ISI had an excellent working relationship with the C.I.A. "It has never communicated to us that they have doubts on our sincerity and credibility," one official said.
But one also understands why the average Alliance investor might have doubts on that score.
But Wittenberg, according to a person who speaks with her regularly, started to have doubts on Wednesday that the race should happen.
One problem for European banks, the E.C.B. said, is that outsiders still have doubts on whether they have been straightforward about how much risk they have on their books.
I have doubt on the type of heart and courage we have in that locker room".
Pietro Nivola, a senior fellow at the Brookings Institution, has doubts on both counts.
"With the necessity to take a position on cases where the commission has doubts on the proposed remedies, the interaction among regulators will become more intense".
If elderly people had doubts on prescriptions and would like to consult their friends or relatives, this information can be showed to their friends and relatives.
The team commented that the protocol for reporting the items through heuristics allowed them to perceive the real impact of each identified usability problem, so they do not had doubts on the adjustments they should fix.
