السلام عليكم 
تحية للمبدعه بأتم معنى الكلمة الغالية أمــــــــــــــــــــــــيــــــــــــــــمة 
اذا لم نساعدك فمن سنساعد
تفضلي حبيبتي 
Have a look at this example
He is a doctor ,isn't he?
The part He is a doctor is a sentence
)[The part isn't he is the tag question
We have to put a comma between the sentence and the tag question
and since the tag question is a question,it has to end with a question mark
.................................................. .................................................. ....................
If the sentence is in the affirmative form,the tag question should be in the negative form
and if the sentence is in the negative form,the tag question should be in the affirmative form
[If the verb of the sentence is the verb to be in the affirmative form,we use ,in the tag question,isn't or aren't
[If it is another verb in the present simple, we use don't or doesn't
If it is another verb in the past simple, we use didn't
If it is a verb in the future, we use won't
and so on
[Examples
? You are tired,aren't you
John lives in London,doesn't he?
Children like games,don't they?
We were late yesterday,weren't we?
I don't speak Spanish,do I?
My parents didn't travel last week,did they?
][Remark
[Never say for I am amn't I but say aren't I
Excercise: Complete with tag questions
She visited me last night
My father will buy a new car next month
They are noisy pupils
It is not going to rain tonight
Jane can do this excercise
He doesn't know about that
Your brother won't come tomorrow