Questions: is a collective body of knowledge, it is a set of basic elements, but these elements can form a great variety of combinations

1- lecture
Questions:
1)............ is a collective body of knowledge, it is a set of basic elements, but these elements can form a great variety of combinations.
2)The distinction between language and speech was made by ................................, the Swiss scholar usually credited with establishing principles of modern linguistics.
3)Indo-European languages are classified into two structural types – ................ ........ ............... .
4)The term "................." goes back to a Greek word that may be translated as the "art of writing".
5)The aim of theoretical grammar is to offer ......................................................... .