I used to teach English as a second language and this is why people learning English have to learn sentence structure in order to know when a word is being used as a verb, noun or adjective.
English speakers learn this subconsciously as children and don't even notice it anymore except when it is used incorrectly and jars on our ears. Even then we know it is wrong, but often cannot say why.

An example is that to an English speaker the sentence
"The motorcyclist was had to bank around the river bank, in order to bank on arriving at the bank in time to bank his savings. However a cloud bank threatened to slow him with rain."
makes perfect sense simply because of the arrangement of the words in the sentence, indicating which of the seven meanings of the word Bank are appropriate at any given point.
A more vulgar example is
"Fuck that fucking, fucker, he's a fucking fuckwit, fucking fuck him!"