Oh,It is OK to go to visit China without knowing local language. I use to have been Beijing but I couldn't speak Chinese. I took a tour travelling Beijing and they provided me an English guide. It is a good time there. Beijing Tour(https://www.travelchinaguide.com/package/beijing.htm) and Shanghai Tour(https://www.travelchinaguide.com/package/shanghai.htm) are good references for you. Well, China Tour Packages(https://www.travelchinaguide.com/package/) also provides you more information about travelling in the two cities. Best wishes for you!