6. Romanian
At number 6 on our list of easiest second languages to learn for English speakers is Romanian that is in the Indo-European language family. It is widely used besides in Romania, in Australia, Azerbaijan, Bulgaria, Canada, Croatia, Czech Republic, Finland, Hungary, Israel, Kazakhstan, Kyrgyzstan, Russian Federation, Serbia, Sweden, Tajikistan, Turkmenistan, Ukraine, the US and Uzbekistan. It is also official language of Moldova.