The students (no están escuchando) to the lecture.
She (no está escribiendo) a monthly report.
I (no estoy preparando) a presentation for Monday.
The manager (no está conduciendo) a meeting right now.
We (no estamos tomando) an exam at the moment.
He (no está dibujando) a graph on the whiteboard.
The colleagues (no están discutiendo) about the project.
You (no estás leyendo) the safety instructions.
The printer (no está funcionando) properly.
Sarah (no está respondiendo) her emails today.