alone · adj
leave sb alone
B2 to stop talking to or annoying someone
Dictionary examples:
Leave him alone, he's tired. (20.2)
let alone
C1 used to emphasize that something is more impossible than another thing
Dictionary examples:
You couldn't trust her to look after your dog, let alone your child. (35.7)
alone (ONLY ONE)
C2 used to emphasize that only one person or thing is involved
Dictionary examples:
You alone know how you feel. (18.6)
Last year alone the company made a million dollars. (24.4)
alone (WITHOUT PEOPLE)
A2 without other people
Dictionary examples:
I'm alone with my computer. It's my best friend and worst enemy! (0.0)
I'm not alone at night. The monsters under my bed keep me company! (0.0)
I'm never alone. My imaginary friend is always here! (0.0)
Do you like living alone? (17.9)
He likes being alone in the house. (29.0)
She decided to climb the mountain alone. (36.6)