Kani
Since you're a stickler for rules, the following are comprehensive lessons on pronouns,
which I happened to found in the book
"When Bad Grammar Happens to Good People"(1) Use the subjective case when…Rule #1a: The pronoun is the subject of the verb.e.g.:
I, we, you, he, she, it, they ran away.
Rule #1b: The pronoun follows a finite form of the verb “to be”
(any form of “to be” except the infinitive form with the
“to” in front of it).e.g.: They believed that the thief was
I, you, he, she.They believed that the thieves were
we, you, they.(2) Use the objective case when…Rule #2a: The pronoun is the object of a verb.e.g.: The search team found
me, him, her, it, us, you, them.Rule #2b: The pronoun is the indirect object of a verb.e.g.: Bob gave
me, him, her, us, you, them all the zucchini
in his garden.
Rule #2c: The pronoun is the subject of an infinitive.e.g. The boss told
me, him, her, us, you, them to do it.
Rule #2d: The pronoun is the object of an infinitive.e.g.: The judge wanted to believe
me, him, her, it, us, you, them.Rule #2e: The pronoun is the object of a preposition.e.g.: Put the blanket over
me, you, him, her, it, us, them.(3) Use the possessive case when…Rule #3a: The pronoun itself is being used to indicate possession.e.g.:
My, your, her, his, our, their toaster.
Moreover, You assumed that every word in English would've only one function or use.
i.e. every word belongs to one class of Parts of Speech (there are eight of them).
For instance, you thought the word "but" is a preposition, but in the examples you cited "but" acts a conjunction.
Also, the word "as" acts a subordinating conjunction by introducing the basis of comparison.
To know more about how the same word can be used as different parts of speech,
please buy a good grammar and learn the basics.
kanigmat011 wrote:
Ruby is tall, but she isn’t as tall as I
We aren't sure who's driving, but it might be she