讨论了三种时间逻辑方法：一阶谓词演算，模态逻辑及具体化逻辑。
Three temporal logics i. e. first-order predicate calculus, modal logic and reified logic are discussed.
这种情况下的断言似乎就需要实现特定的语言扩展，于是一些人建议引入一阶谓词演算。
This kind of assertion seems to require special language extensions and has led people to suggest introducing first-order predicate calculus.
之后，美籍逻辑学家歌德尔一阶谓词演算的完备性定理，这标志着现代逻辑基础部分的完成。
After this, American Logician Kurt Godel proved the completeness theory of predicate calculus. This means the completion of the base of Modern Logic.
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