くらいの => Approximate~ N3
Emphasis on degree
…くらいの…しか…ない => Only… at low level N2
Limit, limit
しばらく => for a moment; for a while; for the time being N3
間 => while; during; between ~ N4
どのくらい => how long N5
瞬間 => At the very moment N3
Short period of time
間に => while; during~ something happened N4
もし~たら/もし~ば => if; in the case; supposing ~ N5
ば~のに/たら~のに => would have; should have; if only ~ N3
(の) なら~しろ => If..., do something... N3
Condition (hypothetical condition)
.... ば…のか => must... N3
Exclamatory
~ばよかった/~たらよかった/~ばよかったのに/~たらよかったのに => If only N3