@yuantanren,
Quote:I have another question about the use of "assure". Can it be followed by a negative statement, like "If there is any hard work to do done, I assure you he won't come."
I assure you he wont come - is acceptable because you are assuring him of a negative outcome.
If you were to say - I can not assure you he wont come - then it is also acceptable even though it seems to be a double negative they are in seperate clauses as "that" is understood between "you" and "he".
So all posibilities :
I can not assure you he wont come
I assure you he wont come
I assure you he will come
I can not assure you he will come
are all acceptable.