When you understand the words one by one, but not what they mean together, use this question. You can ask it whenever you’re confused about what someone is telling you.
A: The Smiths do have a really nice house, but the grass is always greener on the other side.
B: What do you mean?
A: I mean that if we had the Smith’s house, we probably wouldn’t be happier. We always think other people have better lives than us, but other people have problems too.