He agreed with You
You can say, 'are you agreed? as in 'are you all agreed?' or 'do you agree?'. The former is generally used when addressing more than one person in, for example, a meeting, the latter is appropriate when speaking with one person.
i am agreed or i agree
The statement "I agree with you" is correct. "Am" is not needed in this context because "agree" already indicates the present tense.
Agreed is the past tense of agree.
'Agreed' is just one word. Grammar only applies to words in a context. Please give the full context, then someone will be able to answer your question.
The sentence "All is invited" is not grammatically correct. The verb "is" should agree with the plural subject "All," so it should be "All are invited." In this corrected form, the verb "are" matches the plural subject "All," making the sentence grammatically accurate.
By itself, it means "I agree". Within a sentence, it might also mean "you agree", "he agrees", etc., as well as "I agreed", "I will agree", "You agreed", "You will agree", etc.
Both are correct: "I agree with you" would be used most often, but "I do agree with you" could be used for emphasis.
The subject should be singular, problem, to agree with the verb has, or the verb should be have, not has, to be in agreement with the plural subject, problems.
I agree to these following terms.
Well, honey, that sentence is as confused as a chameleon in a bag of Skittles. It should be "Either the teacher or the students are to blame for the fire" to match subject-verb agreement. So, in short, no, it ain't grammatically correct.
"Do you agree" is correct. "Are you agree" is wrong (you'd have to say "are you in agreement").