Examples of using It is difficult to know in English and their translations into Spanish
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                        Official
                    
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                        Colloquial
                    
 
He also incorporated at least some of what his father had written, though it is difficult to know how much.
In these cases, it is difficult to know exactly what is  the country of origin,
It is difficult to know whether the following recommendations, which were  drafted before 1 January 2004,
Response: The panel replied that it is difficult to know if the levels of e-waste are being  reduced by their efforts,
While it is difficult to know to  which movement Ban Ki-moon belongs, since he is
Note that it is difficult to know the exact magnitude of offences committed by children due to  the problem of poor recordkeeping systems, especially at the village level.
It is difficult to know, for the person who travels a long time for this continent,
so sometimes, it is difficult to know which is  the perfect bulb for what we really need.
As it is difficult to know if species that BirdLife does not recognise meet the above definitions,
It is difficult to know how much ammunition remains in circulation in Liberia because figures are  available only for how much was  destroyed(6,486,136 pieces of small arms ammunition and 33,604 pieces of unexploded ordnance),
and today it is difficult to know in some cases if some bridges are  actually Roman
It is difficult to know a priori, because these documents never come in an editable format, that is, 
It is difficult to know whether I exceeded the 50 moves as I spent quite a bit of time on many of the moves working them out on a table Chessboard before entering onto your computer board.
make its début officiel; whereas the weather varied so unexpectedly so it is difficult to know what is  happening.
without clear information on when each was  employed it is difficult to know how to  interpret a particular coded record in the database.
So far, it is difficult to know whether Šešelj will raise a defence,
It is difficult to know if such support was  based on politic interests-due to  the fact that normally a military figure occupied the power,
human rights, it is difficult to know what the Commission wishes of the Special Rapporteur regarding these acts except to  note again that there have been  few new instances of new groups engaging in them.
so it is difficult to know if the requested content has been  blocked