One Schengen visa - for example, Lithuanian - you can see Austria, Belgium, Hungary, Germany, Greece, Denmark (except some places), Iceland, Italy, Latvia, Lithuania, Luxembourg, Liechtenstein, Malta, Norway, Netherlands, Poland, Portugal, Slovenia, Slovakia, Finland, France, Czech Republic, Switzerland, Sweden, Estonia.

That is, the answer to the first question is positive - yes, you can.

English is well spoken in Germany, Austria, France, Ireland and Iceland, in Malta. Poorly and rarely, but they are trying - in the countries of the "former scoop" (Poland, Hungary, Czech Republic, Hungary and others). In Switzerland it is one of the state.