My sister and I are __________—she’s outgoing, and I’m very shy.
My sister and I are LIKE CHALK AND CHEESE—she’s outgoing, and I’m very shy.
I’ve got __________; I can never remember people’s names.
I’ve got A MEMORY LIKE A SIEVE; I can never remember people’s names.
Don’t be fooled by his smile—he’s __________ when it comes to business.
Don’t be fooled by his smile—he’s AS HARD AS NAILS when it comes to business.