(1). My phone rings when I am writing an essay.
(2). My phone is ringing when I write an essay.
(3). When my phone rings, I am writing an essay.
(4). When my phone is ringing, I write an essay.
(5). When my phone is ringing, I am writing an essay.
(6). When I am writing an essay, my phone is ringing.
Are those sentences correct? Would anyone give me an explanation? Thank you.
(2). My phone is ringing when I write an essay.
(3). When my phone rings, I am writing an essay.
(4). When my phone is ringing, I write an essay.
(5). When my phone is ringing, I am writing an essay.
(6). When I am writing an essay, my phone is ringing.
Are those sentences correct? Would anyone give me an explanation? Thank you.