1、upon doing sth

upon doing sth发音

英：　　美：

upon doing sth中文意思翻译

常见释义：

做某事时

upon doing sth相似词语短语

1、upon oath───宣誓后

2、depending on sth───依靠某事

3、coon dogs───猎浣熊的猎犬

4、doing with───利用，处理；需要；忍受；与……相处

5、wrongdoings───n.坏事；不道德的行为

6、preparatory to doing sth───准备做某事

7、no mean sth───毫无意义

8、undoings───n.毁灭；取消；毁灭的原因；vt.解开；取消（undo的ing形式）

9、roll on sth───在某物上滚动

2、when doing和upon doing和once doing的区别？

when doing sth 是省略形式的状语从句，分词的逻辑主语是主句的主语，表示“当……时”，有时候也可表“一……就……”的意义。

如：

When staying at home, I often play chess with my grandpa. 在家时，我常和爷爷下棋。(When staying at home = When I stay at home)

When seeing her mother, the little girl dropped her toy and rushed to her. 一看到妈妈，小姑娘就丢下玩具向她跑去。(When seeing her mother = When / As soon as she saw her mother = On seeing her mother)

1、on /upon doing sth

刚一做某事（就）

结构：介词+动名词

功能：相当于as soon as引导的时间状语从句。

例如：

On arriving home I discovered they had gone.

我一到家就发现他们已经离开了。

= As soon as I arrived home，I discovered they had gone.

= On my arrival home I discovered they had gone. ( on/upon doing必须注意，后面句子主语就是前面doing 动作的发出者。)

On arriving at the village,these college students went to help the farmers with their work.

=As soon as they arrived at the village,these college students went to help the farmers with their work. 这些大学生一到村里就去帮助农民工作。

= On their arrival at the village,these college students went to help the farmers with their work. ( on/upon doing必须注意，后面句子主语就是前面doing 动作的发出者。)

Upon going out of the room,Jack heard his cellphone ringing.

=As soon as he went out of the room,Jack heard his cellphone ringing.( on/upon doing必须注意，后面句子主语就是前面doing 动作的发出者。)

杰克一走出房间，就听到他的手机响了。



2、once doing

一旦做某事

结构：连词once +加动名词，可以看作是once 条件状语从句的省略

功能：相当于once 引导的条件状语从句

例如：

Once trying them on, You can't return underwears.=

You can't return underwears once you've tried them on.

=Once you've tried them on, you can't return underwears.

内衣一旦试穿后就不能退。(once doing sth，必须注意，后面句子主语就是前面doing 动作的发出者)

Once making a promise,you should try your best to fulfil it.

=Once you have made a promise,you should try your best to fulfil it.

一旦做出承诺，你就应该尽力履行。(once doing sth，必须注意，后面句子主语就是前面doing 动作的发出者)

特别注意：后面句子主语与once 后面的动词动作是被动关系时，经常使用过去分词。

例如：

Once bitten,twice shy. 一朝被蛇咬，十年怕草绳。

Once created, LUNs need to be assigned to hosts.

=

Once LUNs are created, they need to be assigned to hosts.

LUN一旦创建，就必须被分配到主机。