Sentence examples for it is often difficult from inspiring English sources

It is often difficult to say.

It is often difficult to discern whether Blatter is serious.

First, it is often difficult to set appropriate support threshold.

It is often difficult to diagnose and treat.

However, it is often difficult to control the etching process.

It is often difficult to distinguish between them.

That sounds straightforward, but it is often difficult or impossible.

However, it is often difficult to distinguish different plasma populations in high altitudes.

Because of the numerous species and reactions, it is often difficult to choose a correct description.

However, it is often difficult, if not impossible, to determine the exact values of these parameters.

However, it is often difficult to find [ 2].