自転車が

bicycle

→ 自転車
phrase Uncommon #9,316
bicycle 自転車 means “bicycle,” and が marks it as the subject of the sentence. Depending on context, it can mean “the bicycle” or “bicycles.”
JA: 自転車が駅前に置いてあります。
EN: My bicycle was left in front of the station.

自転車が壊れちゃった

My bike broke down.

トム自転車が盗まれたんだ

Tom's bike was stolen.

自転車があるか見て

See if there’s a bicycle.

— 自転車泥棒 (1948)

自転車が盗まれました

My bicycle was stolen.

自転車が走る

(The sound of a bicycle riding by)

— 天気の子 (2019)

駅前に多くの自転車が違法止められています

Many bicycles are illegally parked in front of the station.

先週自転車が盗まれたんだ

My bicycle was stolen last week.

彼は自転車が買えない貧しくはない

He isn't so poor that he can't afford to buy a bicycle.

コペンハーゲン自転車が便利な都市です

Copenhagen is a bike-friendly city.

どっちの自転車がいい

Which bicycle do you like better?

どの自転車があなたのですか

Which bicycle is yours?

届けを出したのに自転車が見つかったら

What if the bicycle is found even though I reported it missing?

— 自転車泥棒 (1948)

自転車がパンクした

My bike got a flat tire.