Example sentences of "often difficult [to-vb] the " in BNC.
Next page| No | Sentence |
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| 1 | Experience shows that it is often difficult to assess the extent of exposure to light that samples receive in the market and hence to estimate the degree of exaggeration or acceleration that any one test gives . |
| 2 | It is often difficult to assess the colour vision of mammals , and some which were thought to see in monochrome have been shown to have sensitivity to colour . |
| 3 | But , as James Cable and others have pointed out , it was often difficult to assess the seriousness of his more vehement statements , and how far they were made to test reactions and influence opinion at home and abroad . |
| 4 | In practice , however , it is often difficult to disentangle the two : the choice , use and interpretation of a method are all associated with and contingent upon the object in question . |
| 5 | It was often difficult to dislike the gentle , painted hippies , even though they subscribed to a strange new communal , non-hierarchic lifestyle incorporating the unlawful use of ‘ dope ’ . |
| 6 | As a result it is often difficult to analyse the errors of a probabilistic system in an effort to improve its performance . |
| 7 | It is often difficult to anticipate the time required to undertake a search . |
| 8 | By changing the excitation frequency we can probe the upper-state vibrational levels , but it is often difficult to identify the ν'=; 0 level , which may have low probability of excitation or emission . |
| 9 | It is often difficult to make the policy implementation distinction with reference to a service operated by professionals . |
| 10 | We have seen that it was often difficult to isolate the various sub-domains condensed and subsumed under the general categories of morality and immorality . |
| 11 | Native speakers do not recognise this , but foreign learners of English notice that it is often difficult to hear the unstressed parts of a word in ordinary speech . |
| 12 | No one can predict the sales success of an ad , and it is often difficult to measure the success even afterwards . |
| 13 | Indeed , it is often difficult to imagine the existence of labourism beyond the boundaries of the party . |
| 14 | Membership is gained consciously or unconsciously and it is often difficult to determine the time when a person becomes a member . |
| 15 | As in the public sector , it is often difficult to ascertain the value of the individual 's marginal product ( e.g. , on an assembly line ) . |
| 16 | It is often difficult to distinguish the effects of low infections from malnutrition . |
| 17 | But it is quite often difficult to tell the difference between fact and fantasy . |