The trouble is he's finding Cassie surprisingly hard to catch.

That little Liver had been surprisingly hard to find.

It can be surprisingly hard to remember quite obvious things afterwards.

The paradox is that it has been surprisingly hard to prove the value of such treatments.

It is surprisingly hard to think up any letters that do not come from these easily identified sources.

Press secretaries can be surprisingly hard to get on the phone.

All of which was surprisingly hard to explain to the boat captain.

It can be surprisingly hard to tell, even for your physician.

Surprisingly hard to tell a computer from a person these days.

How he did it was surprisingly hard to teach.