N2 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ/です, so there are no forms to conjugate.
訓練を積む
kunrenwotsumuto put in trainingN2expression
Example sentences1
選手たちは大会に向けて厳しい訓練を積む。
senshutachi wa taikai ni mukete kibishii kunren o tsumu.
The athletes put in rigorous training ahead of the tournament. neutral