At the same time, I am a little sad because I have to say goodbye to my classmates and teachers.

同时，我也有点难过，因为我要和我的同学和老师说再见了。

youdao

We have to say goodbye, but our friendship will last forever.

我们不得不说再见，但我们的友谊天长地久。

youdao

We'll have to say goodbye, my dear friends! Today is Jack's birthday.

我们不得不说再见了，我亲爱的朋友们！今天是杰克的生日。

youdao

It's just that you're soon going to have to say goodbye to the old Hotmail.

ENGADGET

Ultimately, that means we have to say goodbye to things like traditional job security and career paths.

CNN: Freedom key to workplace of the future

You're going to have to say goodbye to your family and friends.

NPR: Detroit Feels Pain Of Big Three's Troubles