1. remember
Now I remember.
Cue cards are used primarily on television to help the actors remember their lines.
Now you've mentioned it, I remember coming here with my parents when I was a child.
Remember that oversleeping is no excuse for being late.
Whenever I hear that song, I remember my youth.
Choose a particular event you remember well.
Tom had been Mary's best friend for as long as she could remember.
Unless it's something fairly impressive, I won't remember it.
I remember it as if it were yesterday, but in reality it was fifteen years ago.
When I was younger I could remember anything, whether it happened or not.
I remember singing scales every day during music lessons.
I remember the event as vividly as if it were just yesterday.
You were thoughtful to remember me in this way.
A good password should be difficult to guess, but easy to remember.
I remember having a hot discussion about the matter with him.
2. understand
I understand.
I don't understand and I'm not used to not understanding. Please explain it once more.
Where is there a drugstore where they understand English?
It is easier to write a bad poem than to understand a good one.
The more I think about it, the less I understand it.
What I don't understand is why Tom didn't stick around and help us.
I understand the general approach, but I'm afraid that I'm getting bogged down in the details.
Any universe simple enough to be understood is too simple to produce a mind able to understand it.
A person with average intelligence would understand that.
I could understand the first few sentences, but the rest of his speech was all Greek to me.
The most essential thing in the world to any individual is to understand himself.
It requires wisdom to understand wisdom: the music is nothing if the audience is deaf.
You may not learn to speak as well as a native speaker, but you should be able to speak well enough that native speakers will understand what you have to say.
How much of what I've written here do you understand?
I understand you are going to spend your vacation in New Zealand.