What it means
Aも〜ばBも expresses that when one person or thing has a certain quality, performs an action, or meets a condition, another person or thing does so as well. It often presents two parallel cases rather than a strict cause-and-effect relationship. The first clause uses a conditional form, while the second clause states the corresponding fact about B. The pattern is common in neutral writing and careful speech.
Usage note
Aも〜ばBも can sound more like parallel listing than a real prediction. For a simple, direct condition with a clear result, use a standard conditional pattern such as 〜なら or 〜たら instead.
How to use it
兄も学生ならば、妹も学生です。
If the older brother is a student, the younger sister is a student too.
兄も元気ならば、妹も元気です。
If the older brother is well, the younger sister is well too.
兄も忙しければ、妹も忙しいです。
If the older brother is busy, the younger sister is busy too.
兄も参加すれば、妹も参加します。
If the older brother participates, the younger sister participates too.
兄も学生ならば、妹も学生だ。
If the older brother is a student, the younger sister is a student too.
兄も元気ならば、妹も元気だ。
If the older brother is well, the younger sister is well too.
兄も忙しければ、妹も忙しい。
If the older brother is busy, the younger sister is busy too.
兄も参加すれば、妹も参加する。
If the older brother participates, the younger sister participates too.