[中心「ちゅうしん」]に => With A as the center N2
Miscellaneous
しか~ない => Only , no more than , There's only N5
Amount
てしょうがない/てしかたがない => Very A; Really A; Extremely A N2
Degree, Level, Amount
~かもしれない => Might A, maybe A, perhaps A N4
Sentence Endings
かも[知「し」]れない => Might A, maybe A, perhaps A N3
Sentence Endings
なかなか => It is hard to do A, N2
Adjectival, Descriptions
もし~たなら => If A … N3
Conditional, While
もしも~なら => If A... N3
Conditional, While
て[頂「いただ」]けないでしょうか? => Could you please A for me? N4
Secondary Verb
でも[差「さ」]し[支「つか」]えない => It's OK if A, it doesn't matter if A N1
Need/Requirements
だけしか => Only A can B , Nothing except N3
Not only, Not even
しかも => Not only A, but B as well N2
(Not)only, (Not) even