It's always nice to find a tour agency in a non-English-speaking country, that advertises having services available in English. But when the advertisement for this service is written in dubiously-grammatised English, it does make you just a little apprehensive of the quality of said service. Here's a photo of the sign for a tour agency here in Potosí — the sign reads: "the guide speak English". Is that so? Well, if he does, then I hope it's better than yours! :P
The guide speak Engrish.