It can be difficult to determine refugees' ages.
It can be difficult to determine which came first, the depression and anxiety or the addiction.
It can be difficult to determine who is ahead, or what strategy is being employed to remain there.
The experience of race intersects with other factors, such as class and culture, so it can be difficult to determine the source of disadvantage.
Because most factory-installed systems are included in the cost of the car or an accessory package, it can be difficult to determine their cost.
Mr. Simpson said that during fast-paced news stories, it can be difficult to determine who is the rightful copyright holder.
Because of privacy laws, it can be difficult to determine from the vague information on your credit report where these unpaid bills originated.
It can be difficult to determine if a patient is suffering from gout or an infection in the joint, as both appear quite similar.
Some teachers have complained that it can be difficult to determine whether students are actually doing the work, or getting help from their parents or others.
If the number of reported sexual assaults rises, it can be difficult to determine whether that means that more people feel comfortable coming forward or whether more women are being assaulted, Ms. Cordes said.
So when something goes wrong, it can be difficult to determine whether the outfitter should be liable, or whether the participant is responsible for the risks, say, in having gone skydiving in the first place.
