Spanish · Chapter 25 · Lesson 10 · Grammar primer
Perception verbs
On the AQA A-level grammar list.
The short version
La vi salir or la vi saliendo
A perception verb plus an infinitive reports the whole action, start to finish. Swap in a gerund and you freeze it mid-flow. La vi salir is 'I saw her leave'; la vi saliendo is 'I saw her leaving', caught on the way out. English reaches for the -ing form by default and Spanish does not: the infinitive is the neutral choice.
La vi salir.
That's the gist. The full article goes deeper - more examples, the edge cases, the why - and the practice below scores like a vocabulary session and earns the same XP.
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10-question session
One question at a time, mixed across the exercises in this lesson. Miss one and it comes back round before the end. There are 14 in all: practise more afterwards if you want them.
Lesson 10 of 11 in this chapter