ずにはすまない/ないではすまない => A must be done N1
Potential, Possibility
~ないではすまない / ずにはすまない      => must; will definitely; can't help but to ~ N1
は...です => to be N5
Describe
…はずではなかった => cannot be (impossible) N3
Surprised
は..語で何ですか => What does it mean... N5
Explain
... はずみ.... => So N2
Result
はどうですか => how about; how is N5
はどうですか => how about; how is N5
Doubt
…ば…はずだ => If ... then perhaps ... N3
Speculation
まずは => Temporary, first of all N5
Consider it
はずだ/はずがない => it must be; it should be (expectation)/cannot be (impossible) N3
すら/ですら => even ~ (with emphasis) N1