How many places have you visited? For example just the small nation of the Czech Republic is very different every 100 kilometers. People in Prague almost universally understand English and very probably use it daily because it's very common to have foreign friends (that reside in Prague); if you attend university, some classes are taught in English and many of your colleagues are foreign. I work in a company that has 150+ people out of which 10 are Czech. People in Moravia do not generally speak English so well. People in Brno sometimes do. The younger generations all around the republic (that attended primary schools after the Velvet Revolution) generally understand English very well and can have a conversation about work as well as about other topics.