The phrase "are left uncertain" is correct and usable in written English.
It can be used when discussing situations, outcomes, or details that are ambiguous or not clearly defined.
Example: "The final results of the experiment are left uncertain due to various unforeseen variables."
Alternatives: "remain ambiguous" or "are not clearly defined".
As the central bank is now standing back while banks scramble for cash, markets are left uncertain whether there has been a fundamental change in policy, analysts say.
Because previous analyses have tended to select only one of these models, clinicians are left uncertain about the temporal relationship between glucocorticoid use and infection.
As no impairment or diagnostic criteria are available for these milder forms, the resulting boundaries with the spectrum of PDDs are left uncertain.
As a result of the data presented above, clinicians caring for premature infants are left uncertain of what would be the most sensible approach to the use of indomethacin prophylaxis in the preterm.
And the future of Coach Pia Sundhage would be left uncertain.
The reader is left uncertain whether rapid judgments should necessarily assume priority over measured ones.
In short The future of these economies was left uncertain, dependent on decisions made elsewhere.I disagree with these arguments.
Eventually, it spreads its tentacles to 9/11; though, as often in Pynchon, it is left uncertain what is conspiracy and what is paranoia.
Many have been left uncertain as to how much money — if any — they will have to spend in the year ahead.
By recalling the entire Norwegian medical contingent starting on 15 May, the fate of nearly a 250,000 refugees – many from the Darfur region – will be left uncertain.
As a result, many Afghans were left uncertain about what kind of deal might be made and uneasy about whether Mr. Karzai would decide to bring back the Taliban and give them power.
