5. I'm sorry he's busy now.
恐怕他現在沒時間接您的電話。
還能這樣說：
I'm afraid he's occupied now.
I'm sorry he is tied up.
應用解析：
You are busy as a bee from morning to night.
你真忙！
6. His line is busy at the moment.
他正在通話。
還能這樣說：
He's talking on another line.
He's on another line now.
應用解析：
at the last moment 在最后關頭；
at the moment 此刻，那時；
every moment 時時刻刻；
for a moment 片刻；
in a moment 一會兒、不久，立即、馬上
7. When will she be back?
她什么時候回來？
還能這樣說：
How long do you think she'll be back?
Do you know what time she'll be back?
諺語：
What is got over the devil's back is spent under his belly.
（錢財）來得不正，去得也不正。
8. She should be back after lunch.
她午飯后應該會回來。
還能這樣說：
The time she can be back is after lunch.
It is after lunch that she should be back.
應用解析：
at the back of one's mind 在記憶的深處，下意識地；
at sb.'s back 跟隨某人，支持某人；
be glad to see the back of 希望擺脫某人；
be laid on one's back 臥病在床