Yes.
"you are with us people"
AND
"we are people"
so...
"we people"
NOT
"us people"
The second one is more correct.
Yes. The form who is the nominative, as opposed to whom.
yes it is a real word. It is also correct grammatically and more stupid is not correct.
It may be grammatically correct, but it is a logical absurdity. more/fewer is about counting more/less is about amount … so… no, it is not correct.
Either is correct, but the term "this list" is another usable form. (More common is "the list below" rather than "the below list".)
No it is not unless it is in the context of an indirect object where "to" or "for" plus the above phrase is grammatically correct. In addition, it is better to say "my partner and I" although that can lead to rather convoluted sentences.
I am, you are, he/she/it is, we are, they are.
The phrase "how don't I" is not grammatically correct. A more correct way to phrase it would be "why don't I."
No.
It's grammatically correct but slightly peculiar. It would be more normal to say something like "I am completing the work now" or "I will complete the work now" rather than "I complete the work now".
No, "most friendly" is not grammatically correct. The correct form would be "friendliest" when comparing three or more things.
Yes
The second one is more correct.
Yes, "is much more easily" is grammatically correct because it follows the correct order of adverbs (much, more, easily) when comparing multiple items or degrees in a sentence.
Yes, the phrase 'what they're doing' is grammatically correct. For example: What they're doing is wrong.
No, it is not. The "question word," why, should be at the beginning of the sentence. Why was she promoted?
Both "you and he" and "he and you" are grammatically correct, but "you and he" is more commonly used in English.