-------Living in a country where you have to speak a foreign language can cause severe social problems as well as practical problems.-----
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When it comes to settling in another country where you can not speak mother tongue, there is a growing debate over whether language lead to several problems in society and individual. Although unknown their's words would not be able to create some problems, but language is the most important way to coexist with them.
A case could be put forward that if people who live in abroad can not speak theirs language, it is able to lead to some social problems. The one of the problems is language barrier. It could be divorced people who are not native speaker from the community. This is because groups that share the same language may avoid other language groups. In addition, there is limitation of economic activity. The inability of speaking language is more likely to difficult to get a job.
As far as realistic issues, they would be impolite. In the field of language, meaning of words can change depending on situation. By speaking wrong words it can make trouble mutually. Also, some non-native speakers feel all alone. When making a relationship, communication should be the most important requisite. There is no doubt that to create deep relationship needs to intherchange mutual thinking and opinions.
For the reasons mentioned above, I totally agree with the opinion that incapability of speaking second language generates some problems because I believe that ability of talking their own language is closely related to quality of life.