Four categories of Maxims in Grice’s Cooperative Principle include all the following EX- CEPT （）.

单项选择题According to Garrett, the errors that demonstrate forward planning in speech production include all the following EXCEPT （）.

A. spoonerism
B. anticipation error
C. grammatical error

单项选择题（） studies the internal structure of simple propositions.

A. Predicate calculus
B. Propositional calculus
C. Sentential calculus