However, if the To Be is in the end of the sentence , To Be should not be abbreviated .
example :
Yes, it is .
Yes , you are .
Yes , I am .
The use of " Not " in a negative sentence can also be shortened by To Be : " is and are " . but its use only for conversation or informal writing ( not official ) , eg letters to friends or relatives .
example :
He is not smart .
He is not smart .
He was not smart .
They are not in the class now .
They are not in the class now .
They were not in class today .
Examples in Conversation :
conversation I
Neztra : I am Neztra . Are you Joe ?
Joe : Yes , I am . How are you ?
Neztra : fine , thanks . Are you well this morning ?
Joe : Yes , I am .
Neztra : Armin is well ?
Joe : No , she is not . Armin is not well this morning . She is sick .
conversation II
Neztra : Hello . I'm Neztra Joe .
Armin : Hello , Neztra . I'm Armin .
Neztra : are you a teacher , Armin ?
Armin : No , I'm not a teacher . I'm a student .
Neztra : really ? Are you a student ?
Armin : Yes , I'm . you are a student , are not you ?
Neztra : Yes . Who is that man over there ?
Armin : I do not know who he is .
Neztra : is she a teacher or a student ?
Armin : I honestly do not know . maybe he is a teacher , and maybe he is a student .
Neztra : it is time to begin the study now , Armin . Good bye ...
Armin : good bye , Neztra . See you later ...
conversation III
Neztra : Whose bag is this ? It is your ?
Joe : Yes , it's mine . Where is your bag ?
Neztra : here it is . Now let 's begin .
Joe : good . Let 's study lesson two .
Neztra : where is Mrs. Armin ? This is her briefcase .
Joe : Mrs . Armin is not here .
Neztra : Whose book is this ? Is it your ?
Joe : No , it is not mine .
Neztra : this is not your dictionary ?
Joe : Yes, it is .
Neztra : this is not your pen , is it?
Joe : No , it is not mine .