Why is "Tugas guru mengerjar siswa-siswanya" not accepted? Both "seorang" and "Adalah" aren't necessary.
Pekerjaan salah?
Why do you have the siswa?You only need the siswanya.
Because it's plural.
Apa perbedaan "siswa" dan "mahasiswa"?
Siswa indicates to students (general) while mahasiswa indicates to university students