Sentence examples for are often very difficult from inspiring English sources

Such cases are often very difficult to prosecute.

The sustained vocal trios are often very difficult.

These attacks are often very difficult to detect.

Current computer-generated route maps, however, are often very difficult to use.

These meetings are often very difficult and this one was no exception.

However, as history shows, such power-sharing arrangements are often very difficult to achieve.

But this is often very difficult.

The experimental determination of ϕ′ is often very difficult, expensive and requires extreme cautions and labor.

This is often very difficult to solve in practice particularly by applying a sole approach.

Exactly what losses or injuries are "natural and proximate" results is often very difficult to determine.

It is often very difficult to distinguish between bronze and brass merely by their appearance.