集中できない

can't concentrate

→ 集中
phrase Rare #26,614
can't concentrate Used when someone is unable to focus, often because of noise, distractions, or an unsuitable environment. 集中できん is an informal shortened form of 集中できない.
JA: 周りが騒がしくて、仕事に集中できない。
EN: It's so noisy around me that I can't concentrate on my work.

が多すぎて集中できない

There are too many people, so I can't concentrate.

— マルホランド・ドライブ (2001)

勉強しようとしてるんだけど集中できない

I’m trying to study, but I can’t concentrate.

音が気になって仕事に集中できないんだ

The noise is distracting me, so I can't concentrate on my work.

屋外の音気になって勉強に集中できない

I can't concentrate on studying because the noise outside is distracting me.