yokattara, kondo toshokan de issho ni nihongo o benkyoushimasen ka.

If you like, shall we study Japanese together at the library next time?

Breakdown of yokattara, kondo toshokan de issho ni nihongo o benkyoushimasen ka.

• を: direct object particle
• 日に本ほん語ご: Japanese (language)
• 勉べん強きょうする: to study

Questions & Answers about yokattara, kondo toshokan de issho ni nihongo o benkyoushimasen ka.

What does よかったら mean here?

よかったら means something like if that’s okay with you, if you’d like, or if you’re interested.

It comes from よい / いい (good) and the conditional form 〜たら (if).
So literally, it is like if it is good, but in natural English it works as a soft, friendly lead-in before a suggestion or invitation.

In this sentence, it makes the invitation sound less direct and more polite:

• よかったら、今度…勉強しませんか。
  = If you’d like, shall we study Japanese together at the library sometime?

Why is there a comma after よかったら?

The comma shows a natural pause.

よかったら is being used as an introductory phrase, like:

• If you want,
• If that sounds good,
• By the way, if you're free,

So the comma helps separate that soft opener from the main invitation.

What does 今度 mean in this sentence?