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 The mechanisms proposed ... will actually generate Р/ are (therefore) at least
plausible
 The proposed algorithm ... is guaranteed to lead to P.
 These principles ... provide/ may become the guidelines for explaining P.
 The scheme discussed above ... will be applicable to/ clearly demonstrates'
provides P
 This statement ... holds for the overwhelming majority of languages.
 Our conclusion ... holds for any set.
•  This view is not the whole story; we may note that P. A word should be said
about P.
 In other words/ Typically, in other words/ To put it another way, ... P (occurs
when Q. We assume, in other words, that P.
1.5.2. Unsolved/ remaining/ new problems; obstacles and barriers

•  One of the more fascinating aspects of the phenomenon ... is that P.
 One startling development ... is that P.
 A striking feature of the calculation ... is that P.
 At a certain point one begins to wonder whether P. It seems surprising to find
that P.
 One cannot help wondering about/ One cannot rule out these unbelievable
effects.
 In the case of P something surprising happens/ has occurred.
 Other bizarre examples abound.
 Either way the situation seems paradoxical.
 The secret to P lies in the mechanism Q. That leaves a disturbing puzzle.
 That intensity poses a puzzle. The puzzle stems from Р/ is challenging to solve.
 The widespread appeal of this view within a scientific context ... is puzzling.
 New data hint at the existence/ scope of P. Now we obtained hints of how
cosmos evolved.
•  (The trouble is that) ...
 There is a discrepancy/ mismatch/ conflict/ contradiction ... between P and Q.
 There is a striking similarity ... between P and Q.
 It is misleading to suggest/ It is (was) strange (uncommon/accidental) ... that P.
 It is hard/ may be difficult to calculate (judge/ imagine) P. It is not clear whether
P.
 It seems impossible to tackle the problem successfully.
 Whether P includes Q is an open question.
•  It is the rate of P ... that will be most troublesome.
 At present we cannot explain ... the discrepancy between P and Q.
 What is less easy to explain is ... how P can induce Q.
 Modeling this phenomenon ... poses a problem for P.
•  (What matters here is that) P ...
... assumed unusual shapes/ exhibited an unusual behavior.
... proved greater than suspected/ may sound attractive, but Q.
... revealed itself with startling clarity/ is not an incidental consequence of Q.

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