a single woman/man/person
He's been single for so long now, I don't think he'll ever marry.
He's 25 years [old] and single. (Preliminary English Test; B1; Arabic)
a single bed
a single room
I [am] sell[ing] a single bed. (Key English Test; A2; Italian)
Many single parents find it difficult to arrange for child care.
single-parent families
She's a single parent, with 3 children from Australia. (Preliminary English Test; B1; French)
I call him every single day.
The decision affected every single one of them.
But we used to play together every single day! (Preliminary English Test; B1; Japanese)
There was a single light in the corner of the room.
Not a single person offered to help her.
You haven't been listening to a single word I've been saying.
The night was calm and not a single sound was disturbing her. (First Certificate in English; B2; French)