guai in English:

Wow!

Wow, it's hot today.

Wow! That's cheap!

Wow, we're finally in Paris. Where should we visit first?

Wow, this brings back memories. This is a picture of when I was five years old.

Wow! It's been a long time.

Wow, your neighbour is an anatomic bomb!

Wow, your brother is really handsome! "And what am I, chopped liver?"

Wow, you're dressed to kill.

He loves her hair, her smile, her eyes? Wow, he is fucking good at telling lies!

Wow, these are tasty doughnuts!

Wow, it's swarming with tourists!

Wow, that's pretty. The sea is shining.

Wow, that's a full rainbow all the way.

Wow, Daniel has put on a lot of weight since the last time I saw him.