During the trip you will meet people from all over the world. These children will not always speak the same language as you. This sounds like a problem, but when the time is there you will play with people you don't even understand. At first you can't communicate in words with others, but your hands and feet will do the work and this is mostly no trouble. Slowly you will notice non English speakers start to learn the language. These might be the easy words, but more than enough to have a conversation. I never had a trouble communicating with others. Learning English and communicating with each other is a natural process, especially learning English for nonnative speakers, they won't even notice.