N3
もしも~なら・もしも~でも
If, Supposing
もしもドラえもんがいたなら、助けてもらえるのに。
If Doraemon were here, he would help us.
Explanation
「もしも~なら・もしも~でも」 has 2 uses
1If ever
「もしも〜なら/たら」: imagines an unlikely case and what would follow: 「もしも宝くじが当たったら、世界旅行をしたい」.
もしもドラえもんがいたなら、助けてもらえるのに。
If Doraemon were here, he would help us.
もしも、今年中に引っ越すのならば、僕が手伝ってやるよ。
Supposing that you move within this year, I will help you.
2Even if
「もしも〜ても」: even if that happened, what follows won't change: 「もしも反対されても、やめない」.
もしも彼がいたとしても、今日中には終わらなかっただろう。
Even if he had been here, we probably wouldn't have finished today.
もしも僕がドラえもんでも助けられない。
Even if I were Doraemon I would be unable to help.