We have to examine situations case by case.

The documents must be examined on a case - by - case basis.

So from case to case it looks somewhat better today.

The principle of case - by - case assessment must apply for agriculture.

It has to be looked at on a case - by - case basis.

That is an undesirable situation, we do not want that situation in the future.

This situation must change.

The situation has changed.

This situation is unsustainable.

Such a situation requires tact.