How do you express future tense in Indonesian?
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Question

Answer

Basically, all sentences that uses "akan" turns it into a future tense sentence, since "akan" in Indonesian loosely translates to "will". For example:
Indonesian: "Saya akan bermain bola nanti sore."
English: "I will play football this afternoon."

Answer

well if there's a form of it, it will be
Subjek + akan + kata kerja ( verb) + keterangan (time signal, etc) 
The "keterangan" is omitable
for example:
1. Kamu akan makan besok.
2. Kita akan bertamasya ke Kebun Raya Bogor.

Answer

saya akan belajar bahasa Indonesia  (misalnya)