Meaning of とすれば in Japanese

Definition of とすれば

とすれば(tosureba)

友ともを得んえるとすれば友ともとなれ。

The only way to have a friend is to be one.

If I happen to end up going abroad, I'd probably go for France.

もし万が一彼女かのじょが日本に来るくるとすれば、ジェーンはとても喜ぶよろこぶだろう。

If she should come to Japan, Jane would be very happy.

もう１度人生じんせいをやり直すやりなおすとすれば音楽家になりたい。

If I were to live again, I would like to be a musician.

そんなことを僕ぼくが期待きたいするとすれば、頭あたまがどうかしているする。

I'd be crazy to expect such a thing.

その計画けいかくは費用ひようの面めんを別べつとすれば、良いものだった。

The plan was a good one apart from its cost.

この明かりあかりで字じを読もうとすれば目めを痛めるいためるよ。

You'll strain your eyes trying to read in this light.

You'll strain your eyes trying to read in this light.

かりに核戦争かくせんそうが起こったとすれば、人類じんるいは滅亡めつぼうするだろう。

If a nuclear war were to break out, mankind would perish.

When we rush to complete our work, we make needless errors.