It would be a good idea to call before we leave.

　　我們出發之前打個電話是個好主意。

　　He was out when I called to see him.

　　我去拜訪時，他不在家。

　　I'll call back at a more convenient time.

　　在方便的時候我會回電話的。

　　If you have any issues, please call this number.

　　如有問題，請撥打這個電話號碼。

　　For more information, call this number.

　　欲知詳情，請撥打此電話號碼。

　　What is he doing calling at this time of night?

　　他干嗎這么晚了還打電話？