Question

By using therefore and so
I have caught a cold. I shall stay at home
He was late. He could not catch the train
He was found guilty. He was hanged
I had a severe headache. I could not attend the school yesterday
He was ill. He could not attend the meeting

Answer 1

I have caught a cold so I shall stay at home.

He was late therefore he could not catch the train

He was found guilty so he was hanged

I had a severe headache therefore I could not attend the school yesterday

He was ill therefore he could no attend the meeting..............

So and therefore meaning is same....(isliye)