He is as poor as a church mouse.
He is as fit as a fiddle though he is already seventy.
Shelly’s father is always as busy as a bee.
The twin sisters are as different as night and day.
The lecture is as dull as ditch-water.
A: Have you seen him run in a race?
B: Yes. He’s as fast as the wind when he runs.
A: But he’s not too good when it comes to studying.
B: One of my friends said he’s as dumb as a post.
A: That’s not a nice thing to say.
B: Maybe it’s not nice, but it’s true.