11.   In this case a possible further extension beyond the horizon would present no problems.

12.   Not surprisingly, dead metaphors as a rule present fewer problems to foreign learners of a language than idioms do.

13.   Obviously, single-syllable words present no problems - if they are pronounced in isolation they are said with primary stress.

14.   The banking system and mail service can present problems for newcomers.

15.   The materials of Fluxus artists were mainly ephemeral or paper-based, or centred on performance art, presenting problems for exhibition organisers.

16.   The need for close supervision is therefore apparent, although this in itself presents problems.

17.   The way pupils use sexually abusive language to insult each other presents particular problems for teachers.

18.   These mountain roads present problems even to experienced drivers.

19.   They have always presented a problem for the application of natural justice.