[corin_]

That's your brain taking a shortcut because you know that "punched" is a verb, and that a verb in that form is likely to be followed by a subject noun, etc. Even if you never study grammar and couldn't even answer the question "which is the verb in this sentence?" your brain has still learned to recognise the different types of word which is why you understand them.

Disclaimer: I'm not a linguist, but by layman's standards I'm pretty confident.