the teacher says he is going to take the exam and the students say they are going to give the exam.

the second sentence is grammatically incorrect.fun is an abstract,uncountable noun.

An "escort" is something or someone that is given to an individual as a mark of respect or as a form of protection. For example, Ministers in our country always have bodyguards surrounding them.Trucks, ships, planes, etc can be escorts too. A "convoy", on the other hand, refers to the vehicles that accompany someone important.Unlike the word "escort", a convoy is usually used to refer to things (cars, lorries, ships, etc); the word is not used to refer to people.

refer to is used in many ways.refer to means pointing to;it means directing to a source for help or information.;it also means mention. here it means to concern or to pertain.something is said concerning the current drama which is happening