I am coming to believe that laws are the prime cause of unhappiness.

The prime cause, they believe, was a succession of dry summers in the mid-1970s.

Britain has a political problem - and it is a prime cause of its economic problems.

Poor ventilation and damp will almost certainly be the prime causes.

Most Americans were convinced that Iraq was a prime cause of 9/11.

A prime cause for alarm is the low unemployment rate, the central bank said.

The question is, therefore, reduced to the prime cause of the disease itself.

He accused the British of being the prime cause.

Further, he said, the evidence makes a "really very impressive" case for hunting as the prime cause.

It identified mineral oil as the prime cause and drew up a list of recommendations.