11.   In the far more complex factory environment the skilled maintenance engineer is likely to have a role for some considerable time yet.

12.   In the Introduction to the Principles, Berkeley spends a considerable time arguing against the doctrine of abstract ideas.

13.   It is likely to be a considerable time before arrangements for any border demarcation can be completed.

14.   Nathan Keyfitz, a professor emeritus of sociology and population at Harvard University, has spent considerable time analyzing the debate.

15.   The class spent considerable time examining these photographs, attempting to anticipate the kind of personalities they were to be working with.

16.   They really are extinct, but managed to compete successfully with the bivalves for a considerable time.

17.   Michael has already spent considerable time in Barcelona.

18.   Fossil fuels such as coal, oil and gas will service our needs for some considerable time to come.

19.   Finding a cure requires considerable time and effort.