"I have to go now," she said.

“我现在得走了，”她说。

I am afraid I have to go now.

恐怕我现在得走了。

Joanna: I have to go now. Bye.

乔安娜：我现在得走了，再见。

I am sorry I have to go now.

我很抱歉，你知道的，我只是。

Sorry, I have to go now.

对不起，我现在必须(不得不)走了。