Do you agree that this book is too difficult to understand ?
Do you agree that this book has been too difficult to understand?
The problem is the one to whom you are asking did not read the book yet, so he can't agree anyway. But, if you ask : Do you believe that this book has been too difficult to understand ? The answer could be, Yes, I do. or No, I don't.
He agreed with You
The correct sentence would be "He could not have been there". This is because 'can' is in the present tense and doesn't agree with the rest of the sentence.
A simple sentence need both subject and predicate to agree to be correct.
Yes. If you remove the word friends the sentence is still correct.
"I agree with you."
I agree with you
Type your answer here... The pronoun does not agree with its antecedent in number.
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.
Write the word or words that goes go in the sentence. The subject is "word," singular, so the verb must agree by also being singular.
"Do you agree" is correct. "Are you agree" is wrong (you'd have to say "are you in agreement").
Both are correct: "I agree with you" would be used most often, but "I do agree with you" could be used for emphasis.
No; the subject and verb don't agree. "Those are Pete's favorite music tapes" is better.