を習わなきゃ

have to learn …

→ を
phrase Rare #38,005
have to learn … An informal contraction expressing obligation; the subject is usually omitted and understood from context.
JA: スペイン語を習わなきゃ。
EN: I have to learn Spanish.

フランス語で食べ物を注文する方法を習わなきゃ。

I have to learn how to order food in French.

ベルベル語を習わなきゃ。

I have to learn Berber.

フランス語を習わなきゃ。

I have to learn French.

ドイツ語を習わなきゃ。

I have to learn German.

日本語を習わなきゃ。

I have to learn Japanese.