Here's why:
* Words can change their grammatical function: A word can be a verb in one sentence and a noun, adjective, or adverb in another. For example, "run" can be a verb ("He runs fast") or a noun ("The run was tiring").
* Word forms change: Even if a word has a distinct verb form, like "-ing" or "-ed," it may be used as a noun ("running") or an adjective ("tired").
So, while there are some common words often used as verbs, they can also have other grammatical functions. It's important to understand the context of a sentence to determine the function of a word.
Instead of memorizing a list, focus on understanding the different parts of speech and how they function within a sentence.