关于Csn的意思和用法的提问

A: I didn't know that = something I didn't know.
"Oh, is that how you're supposed to use this app? I didn't know that."

I didn't see it coming = something I didn't expect.
"The teacher suddenly gave us a pop quiz today on yesterday's lesson! I didn't see it coming and did miserably on it because I fell asleep in class yesterday and didn't get to take any notes at all."

It never occurred to me = something I never thought of.
"I always see her eating salads, but it never occurred to me that she's actually a vegetarian."

A: Can I exchange this watch for another size?

A: he says "I'd like that to remain personal"

A: Have a heart is pleading to someone to be kind or to forgive you. To use both you could say.... Im struggling with this homework. Please just give me a break. Im begging you to have a heart. However have a heart isn't that common of a phrase now-a-days.