GRE长难句7大必会难点4—名词性从句的虚拟语气

尖劍定要命

insist, recommend, must, require, command

S+ V+ O [ that+ O+ (should) V ]

*O in "that" noun clause tends to be substituted by pronouns

*In this context, odds are that "should" doesn't appear in the noun clause, leaving the verb regular in the sentence