勉ben強kyouする　なら、　図to書syo館kan　が　静sizuか　です。 勉ben強kyouしたら、　図to書syo館kan　が　静sizuか　です。

勉べん強きょうする　なら、　図と書しょ館かん　が　静しずか　です。
勉べん強きょうしたら、　図と書しょ館かん　が　静しずか　です。
benkyousuru nara, toshokan ga shizuka desu.
benkyoushitara, toshokan ga shizuka desu.
If you are going to study, the library is quiet.

The たら form is ungrammatical here, because the library is quiet is not something that happens after you're going to study.

Note

The たら form is ungrammatical here, because the library is quiet is not something that happens after you're going to study.

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Nihon-shiki romanizationwatasi ha tyuugoku kara kimasitaHepburn romanizationwatashi wa chuugoku kara kimashita