sure

It means "I am certain that you have noticed the difference."

vsureshHiPlease help me with this statement."I am sure you have noticed his hand writing in his vocabulary book to be different, ........"My question: Does the person mean she/he knows that I have noticed the difference, or she thinks my observation is correct?

Thank you.
( The person was informed that there was difference in the hand writing and when we want to know if the person is wiling to admit that there is difference,I think this way is better to convey it.

"Your observation is correct."

"I am sure you have observed the difference....." stresses on the fact I have seen the difference instead of telling us what she thinks of i

I can't tell who sees it and who wants to know who if the other sees is.

A is talking to B. A is the teacher, and B is the parent, perhaps?
A knows the writing is different. A thinks B knows it too.

A: I have noticed that the writing is different.
B: Yes, I've noticed it too.

A: Have you noticed that the writing is different?
B: Yes, I have

A: Surely

Thank you, BarbaraPA.