Getting it to think at all was the primary problem.

His primary problem has been a lack of putting confidence.

These systems had two primary problems in terms of accuracy.

But this fact will not remain their primary problem for very long.

They are not all economic, but the primary problem is our economy.

Your primary problem at that time of year will be weather.

The team's primary problems could be with its passing game.

It is the elsewhere that has presented the primary problem.

However, the primary problem with the attack was the planning.

So this was the primary problem of their civilization after a while.