The attacks occur frequently in a week and they may last up to 15 minutes.

Rain occurs more frequently in late summer and early fall.

Strong associations will be thought of as having occurred together frequently.

These problems were generally mild and occurred more frequently during the first month of treatment.

Those moments occur more frequently than most of us realize.

The disorder may begin at any age, and occurs more frequently in girls than boys.

This occurs more frequently than we would like in work situations.

The most frequently occurring number in a list is called the mode.

As a result he was good at crises provided they did not occur frequently.

They often occur more frequently in people with a family history of allergies.