Czech Republic: primary language is Czech — English is widely spoken, especially in cities and tourist areas.
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The primary language in Czech Republic is Czech.
English is widely spoken, especially in cities and tourist areas. Common among younger people in Prague and tourist areas, less consistent with older generations.
Learning "hello," "please," "thank you," "excuse me," and "the check please" in the local language goes a long way anywhere, including Czech Republic — locals consistently appreciate the effort.
It's rarely necessary given how widely English is understood in Czech Republic, but it doesn't hurt to have one as a backup.