そうです => That's right N5
Confirm
そうですか => I see, is that so? N5
Situation, case
それでこそ => Such N3
Cause, reason
はどうですか => how about; how is N5
Doubt
はどうですか => how about; how is N5
それはそうと => anyway N2
のほうが...です => one is better than the other N5
Compare
たらどうですか => why don't you; how about ~ N4
Invite and advise
すら/ですら => even ~ (with emphasis) N1
なんでも…そうだ => I heard that; it is said that ~ N3
Vague
それでは => So (Inference) N4
Deduce
それでは => Well then N4
Change the subject of the story