The official language in Tunisia is Tunisian, which is an arabic dialect. Although Tunisians often understand an arabic speaker, an Arab will not always be able to understand a Tunisian easily.

From the 3rd form, tunisian children learn the french language compulsory, so each Tunisian will,  at least in theory, speak also French, and almost all official documents, signs, etc., are written in french, in addition to arabic as well.

There are, however, in recent years efforts taking place to push back the French language, court matters are, for example, dealt with exclusively in arabic language.

In reality, especially with older people, but also with younger ones of a low educational level, there can be significant problems or misunderstandings when conversating in french language only.

English language has recently become a compulsory subject in tunisian schools well. Especially people of higher education degrees speak english very well.

German is rather rare and limited mostly to the words, that the Tunisians need for  dealing with German tourists. To an even lower degree, this is true for many other languages as well, namely Italian, Russian or Spanish.

Authorities usually understand and speak French well, while english and german language skills are being encountered rarely. However, when going into details, arab language is usually used and needed.

Employees in banks and shops in major cities  usually speak english,  as well as medical doctors, but, again, for an in-depth conversation, at least french language skills are needed.

In the areas of "new technologies", such as cellphones, computers, Internet, and the like, you will usually find English speaking staff members and will not need french language skills.

In hotels and shops in the tourist zones, English is widely understood and spoken, to a lesser degree also German, Italian or Russian.