呵 (hē): ตัวแปรของ อะ [a1]

Oh, so you're here! I've been looking for you for ages.

Wow, this watermelon is so sweet! Who bought it?

Hey, why aren't you up yet? It's already noon.

Oh, this problem is actually so simple—I get it now.

Ah, you're right—I remembered it wrong.