jikan ga dekitara, toshokan de nihongo o benkyoushimasu.

If I have time, I will study Japanese at the library.

Breakdown of jikan ga dekitara, toshokan de nihongo o benkyoushimasu.

• 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 jikan ga dekitara, toshokan de nihongo o benkyoushimasu.

Why is が used after 時間?

In 時間ができたら, the verb is できる, and the thing that comes into being / becomes available is marked by が.

So the idea is:

• 時間ができる = time becomes available
• natural English meaning: to have time / to be free

That is why it is 時間が, not 時間を.

A very literal breakdown is:

• 時間 = time
• が = marks what appears/becomes available
• できたら = if/when it becomes available

So 時間ができたら means if/when I have time.

What exactly does できたら mean here?

できたら is the -たら conditional form of できる.

• dictionary form: できる
• past form: できた
• conditional: できたら = if/when it happens

So:

• 時間ができる = time becomes available
• 時間ができたら = if/when time becomes available

In natural English, this usually becomes:

• If I have time, ...
• When I have time, ...

depending on context.