1、upon doing sth

upon doing sth發(fā)音

英：　　美：

upon doing sth中文意思翻譯

常見釋義：

做某事時

upon doing sth相似詞語短語

1、upon oath───宣誓后

2、depending on sth───依靠某事

3、coon dogs───獵浣熊的獵犬

4、doing with───利用，處理；需要；忍受；與……相處

5、wrongdoings───n.壞事；不道德的行為

6、preparatory to doing sth───準(zhǔn)備做某事

7、no mean sth───毫無意義

8、undoings───n.毀滅；取消；毀滅的原因；vt.解開；取消（undo的ing形式）

9、roll on sth───在某物上滾動

2、when doing和upon doing和once doing的區(qū)別？

when doing sth 是省略形式的狀語從句，分詞的邏輯主語是主句的主語，表示“當(dāng)……時”，有時候也可表“一……就……”的意義。

如：

When staying at home, I often play chess with my grandpa. 在家時，我常和爺爺下棋。(When staying at home = When I stay at home)

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

1、on /upon doing sth

剛一做某事（就）

結(jié)構(gòu)：介詞+動名詞

功能：相當(dāng)于as soon as引導(dǎo)的時間狀語從句。

例如：

On arriving home I discovered they had gone.

我一到家就發(fā)現(xiàn)他們已經(jīng)離開了。

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

= On my arrival home I discovered they had gone. ( on/upon doing必須注意，后面句子主語就是前面doing 動作的發(fā)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. 這些大學(xué)生一到村里就去幫助農(nóng)民工作。

= On their arrival at the village,these college students went to help the farmers with their work. ( on/upon doing必須注意，后面句子主語就是前面doing 動作的發(fā)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必須注意，后面句子主語就是前面doing 動作的發(fā)出者。)

杰克一走出房間，就聽到他的手機響了。

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2、once doing

一旦做某事

結(jié)構(gòu)：連詞once +加動名詞，可以看作是once 條件狀語從句的省略

功能：相當(dāng)于once 引導(dǎo)的條件狀語從句

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.

內(nèi)衣一旦試穿后就不能退。(once doing sth，必須注意，后面句子主語就是前面doing 動作的發(fā)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.

一旦做出承諾，你就應(yīng)該盡力履行。(once doing sth，必須注意，后面句子主語就是前面doing 動作的發(fā)出者)

特別注意：后面句子主語與once 后面的動詞動作是被動關(guān)系時，經(jīng)常使用過去分詞。

例如：

Once bitten,twice shy. 一朝被蛇咬，十年怕草繩。

Once created, LUNs need to be assigned to hosts.

=

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

LUN一旦創(chuàng)建，就必須被分配到主機。