Looking on the internet deeply has found these results:

someone writing on their is the most popular phrase on the web.

someone writing on his 139,700 results on the web	someone writing on their 151,200 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
If I see someone writing, I can imitate the way they write. Writing to someone you don't know. Choose not to play a role someone else may be writing for you. Someone was writing an article about Dreamworld. Someone writing that the United States is a rogue state, an axis of evil that must be combated? I see what it says now, but someone erased my writing. Someone else... Someone... Writing with their right hand. He's been living on someone's roof and writing songs for a rock concert he hears in his head.	Someone was writing an article about Dreamworld. Someone writing that the United States is a rogue state, an axis of evil that must be combated? He's been living on someone's roof and writing songs for a rock concert he hears in his head. I see what it says now, but someone erased my writing. Someone else... Someone... Writing with their right hand. Choose not to play a role someone else may be writing for you. If I see someone writing, I can imitate the way they write. Writing to someone you don't know.

someone writing on his

139,700 results on the web

someone writing on their

151,200 results on the web

More popular!

If I see someone writing, I can imitate the way they write.
Writing to someone you don't know.
Choose not to play a role someone else may be writing for you.
Someone was writing an article about Dreamworld.
Someone writing that the United States is a rogue state, an axis of evil that must be combated?
I see what it says now, but someone erased my writing.
Someone else... Someone... Writing with their right hand.
He's been living on someone's roof and writing songs for a rock concert he hears in his head.

Someone was writing an article about Dreamworld.
Someone writing that the United States is a rogue state, an axis of evil that must be combated?
He's been living on someone's roof and writing songs for a rock concert he hears in his head.
I see what it says now, but someone erased my writing.
Someone else... Someone... Writing with their right hand.
Choose not to play a role someone else may be writing for you.
If I see someone writing, I can imitate the way they write.
Writing to someone you don't know.