有些及物动词除了宾语外还要宾语补足语，即你所说的双宾语。例如：You think I did it deliberately, but I assure you (that) I did not.你认为这是我故意干的，不过我向你保证不是的。表物的宾语前面加of是表示“关于”的意思
assure of sth assure sb sth assure sth to sb
assure sb of sth
