Dear Mrs XX,
Thanks for your teaching. Although you have a baby in your body, you teach us patiently. We are very naughty in the lessons too. Hope you will forgive us.
Hope you can have a healthy baby and come back quickly to teach us.
Dear Mrs._____
Thank you for your teaching, I learn a lot of English from you, like sentences, vocabulary words, or some other grammers. And give us homeworks to learn English. You are a nice, kind, and full of knowledge teacher. You still need to care about your health, born the baby very successful. I hope you can come back as soon as possible. We all miss you and your teaching so much.