1. I can't get through.
電話打不通。
還能這樣說：
The line isn't free.
The number is busy now.
應用解析：
get back 回來；取回；報復；
get behind 落后；支持，幫助識破，看穿；
get by 維持生活；走過，通過；躲過；欺騙；
get by on 靠……過活
2. I'm afraid the line is out of order.
線路好像出問題了。
還能這樣說：
I'm afraid I've been cut off.
There is something wrong with the line.
應用解析：
hold the line 不掛斷電話；
in the line of duty 在執行任務時；
line of business 經營范圍；
in line with sth. 與……類似或一致
3. I'm afraid it's bad connection.
恐怕電話連接不好。
還能這樣說：
I'm sorry we seem to have a bad connection.
Maybe there is a fault on the line.
諺語：
A bad workman always blames his tools.
不會撐船怪河彎。
4. I'm afraid we have a crossed line.
恐怕線路串線了。
還能這樣說：
The lines seem to be crossed.
I doubt our line has got crossed with someone else's.
諺語：
No cross, no crown.
無苦即無樂。