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もらわなきゃ

have to get someone to; have to have someone do

→ 貰う
もらわ receive, get + なきゃ Necessity (must / have to)
auxiliary · informal Rare #37,700
have to get someone to; have to have someone do Colloquial contraction of もらわなければならない; used after a verb in the て-form to say that you need or must have someone do something for you.
JA: 医者に診てもらわなきゃ。
EN: I have to have a doctor examine me.
Conjugation of 貰う
Conditional
もらえたらもらったらもらわなきゃもらえれば

医者に診てもらわなきゃ駄目よ。

You need to see a doctor.

払ってもらわなきゃ困る！

You have to pay up! I can't let this slide!

明日、先生に診てもらわなきゃ。

I need to see the doctor tomorrow.