watashi wa tama ni toshokan de shousetsu o yomimasu.

I sometimes read novels at the library.

Breakdown of watashi wa tama ni toshokan de shousetsu o yomimasu.

• は: topic particle
• 私わたし: I
• を: direct object particle
• 読よむ: to read

Questions & Answers about watashi wa tama ni toshokan de shousetsu o yomimasu.

Do I need to say the subject 私, or can I drop it?

You can drop it. Japanese omits subjects when they’re understood, so たまに図書館で小説を読みます。 is perfectly natural. Keep 私は if you’re contrasting with someone else or explicitly setting the topic.

Why use は and not が after 私?

は marks the topic (what you’re talking about). が marks the grammatical subject and often highlights or answers “who/what” specifically. 私がたまに図書館で小説を読みます。 would sound like “It’s I who (occasionally) read novels at the library,” which is only natural if you’re emphasizing the “who.”

What does で after 図書館 do? Why not に?

で marks the place where an action happens. 図書館で = “at the library.” に marks destination or existence: 図書館に行きます (go to the library), 図書館にいます (be at the library). Reading is an action performed at a location, so use で.

What does を after 小説 do? Could I use が?

を marks the direct object of the verb: you read something, so 小説 takes を. 小説が読みます is ungrammatical in this meaning. If you change the verb (e.g., potential: 小説が読めます “novels can be read”), が can appear, but that’s a different structure.