1. The customers grumbled at the slow service in the restaurant.
(Para pelanggan menggerutu atas pelayanan lambat di restoran.)

2. The students grumbled at having to take a pop quiz on a Monday morning.
(Murid-murid menggerutu karena harus mengikuti ujian dadakan pada pagi Senin.)

3. The employees grumbled at having to work overtime without extra pay.
(Pegawai menggerutu karena harus bekerja lembur tanpa bayaran tambahan.)

4. The passengers grumbled at the flight delay caused by bad weather.
(Penumpang menggerutu atas keterlambatan penerbangan yang disebabkan oleh cuaca buruk.)

5. The audience grumbled at the technical difficulties during the concert.
(Penonton menggerutu atas kesulitan teknis selama konser.)

6. The players grumbled at the referee's decision to award a penalty kick to the opposing team.
(Pemain-pemain menggerutu atas keputusan wasit memberikan tendangan penalti kepada tim lawan.)