to lose your train of thought
to have memory like a sieve
in your mind's eye
to have a senior moment
be etched on someone's mind
to jog someone's memory
to go in one ear and out the other
to take a trip down memory lane
The day my son was born is just ...
to be distracted
When you help someone to remember something they have forgotten, you ...
to be extremely forgetful
to ignore or quickly forget what you've heard
In... , she is still a little girl of six, although she's actually a grown woman
To reminisce over memories of past events, especially happy ones
to feel embarrassed because of not being able to remember sth obvious