Thebasicunitinthestudyofmorphologyis______.

Searle'sclassificationofillocutionaryactsisbasedontheclassificationofperformativeverbs.

翻译：Sineethepremiumvarieswiththescopeofinsuranee,extrapremiumisforbuyer'saeeount,shouldadditionalrisksbecovered.

_______thefirstlanguageisusedintheteachingofthesecondlanguageintheGrammar-TranslationMethod.

Beforethe16thcentury,Latinwastaughtandlearnedfor____________.