This paper investigates the syntactic structures of quotative clauses in foreign language study books of the Mid-18th century. The main ideas are summarized as follows. According to the distribution for each type of 94 direct quotations, the structures of all quotations in In-Eo-Dae-Bang belong to Type 3; among the examples of Jung-Gan-No-Geol-Dae-Eon-Hae, Type 3 falls 22% of the quotations while 46% of them belongs to Type 1, indicating that the occurrence of the quotational structures of old expressions is relatively dominant. This suggests that, unlike In-Eo-Dae-Bang which is a foreign language study book of the same period, Jung-Gan-No-Geol-Dae-Eon-Hae contains conservative quotational structures. The distribution for each type of 185 indirect quotation examples shows that Type 3, the quotational structure of modern language - which falls 91% - occurs overwhelmingly more than Type 1 and Type 2 which are the quotational structures of old language. Like in In-Eo-Dae-Bang containing a number of examples, Type 3 occupies 74% in Jung-Gan-No-Geol-Dae -Eon-Hae. This clearly indicates that the quotational structures of Type 1 and Type 2, in which words leading quotational clauses appear, do not suffice to express abstract contents or subjectivized quotational words.