…ば ... た => If ..., then would have N3
Regret
~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
~仮に...とすれば / としたら / とする => ~If..., suppose... N1
Condition (hypothetical condition)
からつくる/でつくる => made from; made with N4
てくる => to start ~ N4
Situation
かりに…たら/…ば => If..., suppose... N3
Condition (hypothetical condition)
いちど .... ば/... たら => Just... once N4
Conditions (sufficient conditions)
いったん~ば/と/たら   => Once you do something N2
Necessity, obligation
てくる => Already... now (Appearance) N4
Situation
…ばあいもある => there are cases… N3
Ability
てくる => to continue to now N4
Continuous
てくる => ...Approaching (Movement toward proximity) N4
Time