back造句？

1.I'll call back at a more convenient time.在方便的時候我會回電話的。

2.I can call back later ─ it's no trouble.我可以過一會兒回電話，沒關系。

3.Could you call back later, please?請稍后再打電話來好嗎？

4.She said she'd call back.她說她會再打電話來。

5.Can you call back tomorrow?明天你能回電話嗎？