I'm Indian.

I agree with you remarks.

At first you have to understand where should we use "is" and "are". ______________________________ Is is use when the subject is 3rd person singular number. Ex :- He is a student. Are is use when the subject is plural number and also 2nd person singular number. Ex :- They are best friends. You are my friend. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: In 1st sentence the subject is "you"."You" is 2nd person singular number, so we should use "are". In 2nd sentence the subject is "your brother". "Your brother" is 3rd person singular number , so we should use "is'. So that is the difference between of two sentences. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

I am fine and what's about you ?

This is wrong sentence. At first you have to understand what is the difference between of "America" and "American" :- America :- is a state. American:- are those people who lives in America. So, the correct sentence is :- Are they from America? or Are they American?

takes

This is wrong sentence because there is no verb. Please write this sentence like that :- What is your name ?

The full form of INDIA is :- I- Independent N- Nation D- Declared I- In A- August.

to

The full form of GST is Goods and Services Tax.