A new difficulty has arisen.
Some unexpected difficulties have arisen.
Some of the greatest transformations in the history of life on our planet have arisen as a result of migration.
The children had already arisen and were excitedly waiting to open their Christmas presents when my wife and I got out of bed.
The government seems to be exploiting the environment of fear which has arisen as a result of the terrorist attacks on New York to introduce some laws which seriously curtail civil rights.
The question has arisen as to whether such lone-wolf attacks will continue.
Cantor and his colleagues wondered how those different dialects might have arisen.
Several myths and misconceptions have arisen over retirement, particularly over the financial aspects.