1.at table和at the table:

(A)at table是“吃饭”之意。例如：

1)They were at table when I got to his house.当我到他家时，他们正在吃饭。

2)It is bad manners to blow your nose at table.吃饭时擤鼻涕是不礼貌的。

(B)at the table是“在桌旁”之意。例如：

They were sitting at the table playing cards.他们坐在桌旁玩纸牌。

2.in charge of和in the charge of:

(A)in charge of是“管理;照料;负责;主持”之意。主体是人。例如：

1) Mr. Wang is in charge of Class Two.王先生负责二班。

2)The nurse was left in charge of the children.保姆留下来照料孩子们。

3) Who is in charge of the money for safekeeping? 谁负责保管这笔钱?

4)The person in charge of the construction received us.工地的负责人接待了我们。

(B)in the charge of是“由……照料(负责，管理)”之意。主体是被照料的物或人。例如：

1) The documents are in the charge of Mr. Liu.这些文件由刘先生保管。

2)The girl was safely in the charge of a nurse.这个女孩由保姆照料，很安全。

3)This operation is in the charge of Doctor Jackson.这次手术由杰克逊大夫负责。

3.in front of和in the front of:

(A)in front of(=before)是“在……前面”之意，指的是“在某个地方范围以外的前面”。例如：

1)There is a bus-stop in front of our school.在我们学校前面有一个公共汽车停*站。

2)There are some trees in front of the house.房子前面有一些树。

3)Oliver could scarcely see anything in front of him.奥利弗几乎看不见他前面的任何东西。

4) Would you like to sit in front of us? 请你坐在我们的前面好吗?

5)We couldn’t read the notice on the board because several people were standing in front of it.我们看不到布告栏上贴的公告，因为有几个人正站在它前面。