Natural english

So he resigned from his job. He started his own business.
Did he resign from his job? 
 
 
Yes, he resigned from his job. 
 
Why did he resign from his job?   
Because he needed free time. 
 
 
Who started his own business?   
Nick started his own business. 
 
Did he begin his own business?   
Yes, he began his own business.   
Did he take up his own business?   
Yes, yes, he took up his own business. 
Did he give up his own business?   
No, he didn’t give up own business. 
 
What did he give up? 
 
 
 
He gave up his job.  
 
 
Did he quit his job?  
 
 
Yes, he quitted his job.