e.g. You’ve really got a memory like an elephant – still remember the name of your kindergarten teacher.
A: What, don’t you forget that? I borrowed 5 dollars from you at lunch time.
B: Oh right. I really have a memory of a goldfish.
e.g. I was supposed to go to the movies with my friends, but I totally forgot that. I really had a memory like a sieve.
所謂「再鋒利既刀都有生銹既一日」，有時候最好記性嘅人都會一時唔記得左啲野，英文可以講成 [something] slip my mind.
e.g. It slipped my mind that I had a test today.
如果唔記得帶某樣野，英文可以講 I forgot [something]
e.g. Oops. I forgot my textbook at home.