がいれば

if there is/are; if someone or something is present

→ が
phrase Rare #31,752
if there is/are; if someone or something is present A conditional form of いる (to be/exist, for people and other living things), usually following a subject marked by が. Depending on context, it can also mean “if someone has …” or “if there were ….”
JA: 僕にきれいなガールフレンドがいればなあ。
EN: If only I had a beautiful girlfriend.

僕にきれいなガールフレンドがいればなあ。

I wish I had a pretty girlfriend.

夫が家を買った時“カラスがいればいい”といるの?

When my husband bought the house, did he say, “As long as there’s a crow, that’s all I need”?

— どん底作家の人生に幸あれ! (2019)

紅茶が好きな人がいれば、コーヒーのほうが好きな人もいる。

Some people like tea, while others prefer coffee.

お互いがいればそれで十分だ

As long as we have each other, that's enough.

— ムーラン・ルージュ (2001)

父上がいれば…

If only Father were here…

— インディ・ジョーンズ/最後の聖戦 (1989)

家にネズミがいれば道化ではなく駆除業者を呼ぶ

If there’s a mouse in the house, call an exterminator, not a clown.

— 帰ってきたヒトラー (2015)