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Grammar II - 18.05

~ばよかったです - ~ba yokatta desu

 

~ば ようかった です - ~ba yokatta desu means I wish I had done or I should have done something.
You can use it to describe an alternative course of action you, to your regret, did not take.

あの時、
「愛している」と言えばよかったです。

I wish I had told her that I loved her.

ano toki,
"ai-shite iru", to ie-ba - yokatta desu.

 
彼女と別れなければよかったです。 I should not have broken up with her.
kanojo-to wakare-na-kereba - yokatta desu.  
  All verbs can regularly be turned into a ばよかったです sentence with no exception or irregularity.
You form the ば-form on the basis of the present tense short forms.
   
  Verbs in the affirmative:
  Drop the う and add: えば:
食べる -> 食べれば

to eat / if had eaten

taberu -> taber-eba

 
   
行く -> 行けば to go
iku - ikeba  
待つ -> 待てば to wait
matsu - mateba  
買う -> 買えば to buy
kau - kaeba  
する -> すれば to do
suru - sureba  
くる -> くれば to come, to arrive
kuru - kureba  
   
  Verbs in the negative:
  Drop the final い and add ければ:  

食べない -> 食べなければ

not eat / if had not eaten

tabenai -> tabe-na-kereba  
   
行かない -> 行かなければ not to go

ikanai - ikanakereba

 
待つない -> 待たなければ not to wait
matsunai - matanakereba  
買わない -> 買わなければ not to buy
kawanai - kawanakereba  
しない -> しなければ not to do
shinai - shinakereba  
こない -> こなければ not to come, not to arrive
konai - konakereba