Improve Spoken English - Giving Reason in English -

Example basic conversation in English. How to give reason for something.

Formal
The principal has called Rahim into his chamber to talk to
him about an offer of scholarship to study in Malaysia.
Principal : Don’t you think the scholarship is a great boon
you’ve got. Why do you decline this offer?
Rahim : I do realise the value of the scholarship, sir. But if I
could explain, my mother doesn’t want me to go
overseas.
Principal : Why?
Rahim : You know, Sir. I am a fatherless boy and I’m the only
son at home. My mother living alone for three years
in my absence! She cannot even think of it.
Principal : Nobody to take care of her?
Rahim : My uncle, my mother’s brother, is already in Dubai.
Principal : Oh, I see. Then you are justified.

Informal
Leela and Brinda are friends staying in a college hostel.
Leela : Hi! Good morning! Where were you all the while?
Brinda : I’m very much here.
Leela : But I couldn’t see you at breakfast.
Brinda : Well, I woke up early this morning so that I could go
for a long walk.
Leela : Didn’t you have your breakfast?
Brinda : I did. I was the last person to come out of the dining
hall.