During the 1970s, major changes began to occur in the student population.

The pressure is turned up when more child murders begin to occur.

Investigation of environmental impacts is just now beginning to occur.

Problems begin to occur in journeys of over one hour.

According to at least some independent evidence, that is beginning to occur.

It now began to occur to him that his hobby might not be legal.

This is the stage where sexual activity may begin to occur.

That's the age when early signs of eye disease and changes in vision begin to occur.

It began to occur to me that I wasn't the hero.

Growth began to occur in the district during the latter part of the 1980s.