No. Us is the objective case, not the nominative case (we).
It should be:
We teens need more sleep. Or:
We, as teens, need more sleep than others.
No, the sentence "Is Us teens need more sleep" is not grammatically correct. It would be more correct to say "Do US teens need more sleep?" to form a grammatically correct question.
The phrase "how don't I" is not grammatically correct. A more correct way to phrase it would be "why don't I."
No, "you is" is not grammatically correct. The correct form is "you are" when referring to more than one person or "you are" when referring to one person.
No, "most friendly" is not grammatically correct. The correct form would be "friendliest" when comparing three or more things.
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.
Could you please provide more context or details about what "they" are doing in order for me to determine if it is grammatically correct?
The phrase "how don't I" is not grammatically correct. A more correct way to phrase it would be "why don't I."
No, "you is" is not grammatically correct. The correct form is "you are" when referring to more than one person or "you are" when referring to one person.
No.
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.
Both "you and he" and "he and you" are grammatically correct, but "you and he" is more commonly used in English.
Both sentences are grammatically correct, but the second one is more concise and direct in conveying the same message.
No, it is not grammatically correct to say "what all do you expect." A more correct way to phrase this question would be: "What do you expect?" or "What are your expectations?"
It would be more grammatically correct to say "apply for"
Yes, it is correct to say "I would be more than happy to." This phrase conveys enthusiasm and eagerness to help or participate in something.
Yes. The form who is the nominative, as opposed to whom.