Indeed, it is doubtful if Byzantine society could have tolerated another Basil II, despite all his triumphs.
Indeed, it is doubtful that you can build a more sustainable agriculture without animals to cycle nutrients and support local food production.
Indeed, it is doubtful whether Israel's standard heavy military reaction to Palestinian violence serves the interests of peace in the longer run.
Indeed, it is doubtful whether Venezuela will be able to hold competitive, transparent and fair elections at the end of this year.
Indeed, it is doubtful whether, in a figurative sense, she has ever looked at a map in her life; she lacks a goal, a plan, an inner compass, anything resembling a sense of direction.
While true that it will have the power to levy fines on a persistent offender of up to £1m, the chances of any paper being fined seem very doubtful indeed.
The great differences between a country and a town life, as regards health, are that in the latter we breathe a less pure air, and enjoy fewer opportunities of healthful out-door exercise.The purity of the air is quite as important to our well-being as the wholesomeness of our food; indeed it is doubtful if it is not more so.
Indeed it is doubtful that junk passes any of the tests for possibility that gunk passes.
Indeed, it's doubtful whether the ideology of Iran's Islamic Revolution strictly approves of nation-states in the modern sense.
(Indeed, it is doubtful whether Neurath's radical fallibilism, most clearly expressed already in 1913, ever wavered).
