13. When is a proper time to call?
什么时候打来最合适？
还能这样说：
When is a good time for calling?
When is he available?
谚语：
In time of prosperity, friends will be plenty; in time of adversity, none amongst twenty.
富在深山有远亲，穷在闹市无人问。
14. I'm also finding him.
我也正找他呢。
还能这样说：
I'm also trying to get him.
I don't know where he is, neither.
谚语：
Water finds its own level.
水往低处流。
15. Could you possibly ask him to call me back?
你可以叫他给我回个电话吗？
还能这样说：
Can you tell him to give me a phone call later?
Will you inform him to return my call?
应用解析：
Ask me another!
问点新鲜的！多此一举！我怎么知道！（通常用于回答熟人无聊的提问）
16. This is a call from Laura.
是劳拉打来的电话。
还能这样说：
A phone from Laura.
Laura wants to speak to you.
17. I'm sorry for letting you wait so long.
很抱歉让你等这么久。
还能这样说：
Sorry for keeping you waiting for me such a long time.
I feel sorry that you have been waiting here.
应用解析：
wait a bit 等一下，稍等一等；
wait out 在外面等着，等到……结束；
wait up (for) 熬夜等候