Examples:

• I'm so sorry I forgot your birthday, I have a memory like a sieve.
• Don't tell him to buy milk, he'll forget. That man has a memory like a sieve.
• I keep losing my keys; I think I have a memory like a sieve.
• He's always forgetting appointments; his memory is like a sieve.
• I studied hard for the test, but my memory is like a sieve, so I'm worried.
• She promised to call me back, but she has a memory like a sieve, so I doubt she will.
• I told him three times, but he forgot again. Does he have a memory like a sieve?
• I can't remember what I had for breakfast this morning. My memory is terrible, like a sieve.
• He's always losing his glasses. It's like he has a memory like a sieve for where he puts them.
• I wrote down the shopping list, but I left it at home. My memory is like a sieve today.
• She's supposed to meet her friend at the cafe, but she might forget. Her memory is a sieve.
• I told him the directions twice, but I don't think he remembered. He has a memory like a sieve.
• I keep forgetting people's names. It's embarrassing; I feel like my memory is a sieve.
• He's supposed to pick up the kids from school, but I wouldn't be surprised if he forgets. His memory is terrible.
• I made a list of things to do, but I already forgot the first item. My memory is a sieve today.
• She's trying to learn a new language, but she's struggling because her memory is like a sieve.
• He's always losing his phone. It's like he has a memory like a sieve for where he puts it.
• I told her the time of the appointment, but I'm not sure she remembered. She has a memory like a sieve.
• I keep forgetting to pay my bills on time. My memory is terrible, like a sieve.
• He's supposed to meet his client at 2 pm, but he might be late. He has a memory like a sieve.