Perceived actions (che + imperfect)

To describe an ongoing action that you witnessed—like "I saw the waiter cleaning"—Italian uses a specific structure with che instead of an "-ing" verb.

Describing Perceived Actions

Use a verb of perception (like vedere, to see, or guardare, to watch) followed by this formula:

[Perception verb] + [Object] + che + [Imperfect verb]

Because you are describing an action actively in progress exactly when you perceived it, the verb following che must be in the imperfect tense.

I saw the waiter cleaning the counter.
Ho visto il cameriere che puliva il bancone.
I was watching the girl eating a croissant.
Guardavo la ragazza che mangiava un cornetto.

This structure works with any verb of perception, such as observing (osservare), noticing (notare), or hearing (sentire).

I was observing the man sipping his tea.
Osservavo l'uomo che sorseggiava il suo tè.
I noticed the child spilling the milk.
Ho notato il bambino che rovesciava il latte.
I heard the cup hitting the saucer.
Ho sentito la tazza che sbatteva sul piattino.

Adding Detail

If you want to describe the person or thing you are observing, place the adjective immediately after the noun, right before che.

I was watching the impatient lady gesticulating.
Guardavo la signora impaziente che gesticolava.