你打算学中文了?用英语

you plan to learn Chinese?
you intend to learn Chinese?
you decide to learn Chinese?
plan 计划（在上面的句子了表示打算）
intend 打算
decide 决定
用study代替learn也行，意思都一样。

Have you planed to learn Chinese?
你打算学中文了

Have you decided to learn Chinese?
你决定学中文了吗?

Have you decided to study Chinese?