Example sentences of "hard to be sure " in BNC.

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No	Sentence
1	It is hard to be sure how much of this dark stuff Sinclair believes — as it is hard to be sure how much Eliot believed of the lore which accompanies the dark stuff of The Waste Land , another London poem .
2	It is hard to be sure how much of this dark stuff Sinclair believes — as it is hard to be sure how much Eliot believed of the lore which accompanies the dark stuff of The Waste Land , another London poem .
3	It is hard to be sure about the year the photograph was taken , since the monuments of both Pahlavis were pulled down several times , whenever the occasion presented itself to the people . ’
4	After the initial impetus has run out , he wrote , and before one has got in so far that it is easier to finish than to go back , it is then that it becomes hard to be sure of your footing , hard to know why you are doing what you are doing , hard to know if you are doing correctly what you are doing .
5	But even there it is hard to be sure that there was no ultimate control from the temples .
6	Because the hair , too , was black it was hard to be sure that it was not simply matted and dried insects .
7	It 's so hard to be sure .
8	At some point ( it is hard to be sure when ) we started to move slowly east .
9	It was hard to be sure why she was such an unattractive child .
10	Even after she had switched off the small lamp beside the bed , so that the room was completely dark , it was hard to be sure if she was really seeing something , or if her eyes were just playing tricks .
11	Although the Yerkes-Dodson law provides an additional prediction which can be tested , it suffers firstly from the problem that it is often impossible to define task difficulty a priori and secondly that even when this is done successfully it is very hard to be sure that task difficulty does not itself affect arousal .
12	And almost one more , I think , although it 's hard to be sure out here .

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