主从句情态动词would的用法

1) If you know his address, I would be very grateful if you would phone me. I have tried to phone you several times but your phone didn’t seem work.

2) I would be very grateful if you would tell me when I may expect to hear your decision.

请教老师，上述两句would应该属于同一性质的用法。

1. would be grateful和从句中would phone/tell的would分别是何用法？

2.拿第一句举例，可否说If you know his address, I will be very grateful if you phone me. I have tried to phone you several times but your phone didn’t seem work.

3. 第二句的may表示 '可能' 吗？谢谢老师。