〜でよければ

About

The ～でよければ pattern is a combination of だ's て form (で) and the conditional form of the い-adjective 良よい.

～でよければ attaches to nouns, and expresses "If (noun) is okay...".

E.g. あの店みせでよければ予約よやくしておくよ。

"If that restaurant is okay (with you) I'll go ahead and make a reservation."

～でよかったら and ～でよろしければ are also possible, with the former being more casual, and the latter being more polite.

E.g. ウィスキーでよかったら用意よういするよ。

"If whiskey is okay, I'll prepare some."

E.g. スイートルームでよろしければ空室くうしつがございます。

"If a suite room is acceptable, we have an empty one of those."

も may also be added to put more emphasis on the "if" of a 〜でよければ statement.

E.g. Sサイズでもよかったら貸かしてあげるよ。

"If a small size is okay, I'll lend you one."

Summary

• 

  ～でよければ attaches to nouns, and expresses "If (noun) is okay..."

• 

  ～でよかったら and ～でよろしければ are also possible, with the former being more casual, and the latter being more polite

• 

  も may also be added to put more emphasis on the "if" of a 〜でよければ statement (でもよければ)