Looking on the internet deeply has found these results:

Ali is writing a letter is the most popular phrase on the web.

letter is being written by Ali 10 results on the web	Ali is writing a letter 17 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	20 ???? (????) 2014 ... Ali is writing a letter A letter is being written subj.+is/are+being+p.p Past Simple Ali wrote a letter A letter was written by Ali subj.+was/were+p.p�... Nov 21, 2008 ... No, Ali is writing a letter. 2. Hay?r, Hasan �devini yap?yor. / No, Hasan is doing his homework. 3. Hay?r, Hasan hi� mektup yazmaz ama arar. Jan 1, 2006 ... As in the following example Ali is agent: �Ali is writing a letter with a pen.� A procedure that understands such a sentence must discover the�... �Ali is writing a letter with a pen.� A procedure that understands such a sentence must discover the agent because he performs the action of writing, that the letter�...

letter is being written by Ali

10 results on the web

Ali is writing a letter

17 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

20 ???? (????) 2014 ... Ali is writing a letter A letter is being written subj.+is/are+being+p.p Past Simple Ali wrote a letter A letter was written by Ali subj.+was/were+p.p�...
Nov 21, 2008 ... No, Ali is writing a letter. 2. Hay?r, Hasan �devini yap?yor. / No, Hasan is doing his homework. 3. Hay?r, Hasan hi� mektup yazmaz ama arar.
Jan 1, 2006 ... As in the following example Ali is agent: �Ali is writing a letter with a pen.� A procedure that understands such a sentence must discover the�...
�Ali is writing a letter with a pen.� A procedure that understands such a sentence must discover the agent because he performs the action of writing, that the letter�...