Different kettle of fish

Meaning:

If we say that something is a different kettle of fish, we mean that it's completely different from something that we talked about before. If we say that someone is a different kettle of fish, we mean that s/he is completely different from a person we talked about before.

Example sentences:

1. That's a different kettle of fish.
2. It's an entirely different kettle of fish.
3. He's a different kettle of fish.

Example dialogue:

A: How is the weather in Canada?
B: It's wonderful in the summer.
A: How about in the winter?
B: Well, now that's a different kettle of fish.

Practice:

Make your own sentence with "a different kettle of fish".