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... is insufficient to determine Q/ may seem undesirable here.
... is not at all clear/ may come in various guises/ cannot secure our
understanding of Q.
... poses an as yet unsolved problem/ should not divert our attention from Q.
... vanishes under further scrutiny/ deepens the mystery of how the galaxies
formed.
 This ... is a frustrating lesson/ an unpleasant consequence of P.
... is a vexed (and troubling) question.
... raises an unanswerable question of whether Р/ presents one with a dilemma.
... may conceal a great deal of information (about variation).
•  A word of caution ... is needed about this concept/ approach/ idea.
 There is ... a danger in relying too much on P as an explanation.
 There is no ... conclusive evidence on the trend of P.
 There are no ... clear ways (procedures) of testing P.
 There may be instances ... which are uncertain/ about which we are uncertain.
 There is ... (considerable) confusion over this difference.
 П.е confusion arises because of P. Another instance of this confusion is that P.
 The main source of confusion ... seems to reside in differentiating between P and
Q.
 Much of the confusion in the field ...lies in a mistaken claim that P.
 This question ... leads to a paradox/ is not yet accurately formulated.
 These conditions ... could complicate the assessment of P.
 Lack of P has been a serious obstacle to Q.These stereotypes affect attitudes
towards P.
 P should not be confused with Q.
 A positive answer cannot be based on crediting that P. We must take care not to
misinterpret the difficulty that P. Serious obstacles lie in P.
 The extrapolation of P must be made with caution.
•  The difficulty may be put briefly/ One added complexity presents itself, P.
 Progress in analyzing P has been hindered by the lack of information concerning
Q.
 Nobody yet knows what is P. We know less than we thought we knew about P.
(Comparatively) little is known ... about the distinctions to be drawn between P
and Q.
 Whether P influences Q ... is not known at present/ remains unknown.
 P reflects our lack of knowledge about Q, For P it is necessary to have
knowledge of Q.
 Our knowledge of Р/ in this sphere ... is scant and fragmentary.
... is insufficient to determine Q.
•  There is a gap/There are many gaps ... in our (theoretical) understanding of these
processes.
 This controversy ... has left several theoretical tasks unaccomplished.
 The debate over the data continues, ... involving astronomers.
 Researchers today/ Some biologists ... suspect that Р/ are worried that P.
 Scientists ... have yet to identify phenomena that exhibit P.

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