Select all that apply: Which sentences correctly form a past continuous passive for an action under way then?
The screen was being lowered when the music started.✓Respuesta correcta
The bicycles were been repaired during the afternoon.
The seedlings were being watered when the sun appeared.✓Respuesta correcta
The platforms was being cleaned at midnight.
Explicación
The screen and seedlings sentences correctly combine a past form of be with being and a participle. The bicycles sentence substitutes been, and the platform sentence uses was despite its plural subject.