5．以when，while引導(dǎo)的時(shí)間狀語從句和以if引導(dǎo)的條件狀語從句，如果從句主語和主句主語一致時(shí)，可簡化為現(xiàn)在分詞狀語，表示謂語動作發(fā)生在該狀語動作的進(jìn)行過程之中。
例如：
When he turned on the radio，he found it broken．(簡化前)
When turning on the radio，he found it broken．(簡化后)
While she was walking along the street，she was hit by a car．(簡化前)
While walking along the street，she was hit by acar．(簡化后)
6．原因狀語從句的主語與主句主語一致時(shí)，可簡化為分詞短語作狀語。例如：
Since l didn't know Chinese，I tried to speak to her in English．(簡化前)
Not knowing Chinese，I tried to speak to her in English．(簡化后)
要注意的是，形容詞短語也可用作表示原因的狀語，用以代替原因狀語從句，放在句首、句末均可，但一般應(yīng)加逗號。例如：
As he was thirsty and eager to get a little rest，he went into the tea-house．(簡化前)
Thirsty and eager to get a little rest，he went into the tea-house．(簡化后)
7．在時(shí)間、原因、條件等狀語從句中，若從句和主句主語不一致時(shí)，可簡化為分詞復(fù)合結(jié)構(gòu)作狀語。有時(shí)也可簡化為“with/without名詞或代詞十分詞(短語)”形式作狀語。例如：
When the film start appeared, the children got exited．(簡化前)
The film start appearing，the children got exited．(簡化后)
If all the work is done, you can have a rest．(簡化前)
With all the work done，you can have a rest．(簡化后)
Nothing can live if there is no air．(簡化前)
Nothing can live without air．(簡化后)
8．讓步狀語從句的主語與主句主語一致時(shí)，可簡化為分詞短語。
作狀語；不一致時(shí)，常簡化為with或in spite of介詞短語作狀語。例如：
Although he faced his death，he didn't say anything before the enemy．(簡化前)
Facing the death，he didn't say anything before the enemy. (簡化后)
Although there was danger，he rushed out to carry the boy to safety．(簡化前)
In spite of danger，he rushed out to carry the boy to safety．(簡化后)
例如：
When he turned on the radio，he found it broken．(簡化前)
When turning on the radio，he found it broken．(簡化后)
While she was walking along the street，she was hit by a car．(簡化前)
While walking along the street，she was hit by acar．(簡化后)
6．原因狀語從句的主語與主句主語一致時(shí)，可簡化為分詞短語作狀語。例如：
Since l didn't know Chinese，I tried to speak to her in English．(簡化前)
Not knowing Chinese，I tried to speak to her in English．(簡化后)
要注意的是，形容詞短語也可用作表示原因的狀語，用以代替原因狀語從句，放在句首、句末均可，但一般應(yīng)加逗號。例如：
As he was thirsty and eager to get a little rest，he went into the tea-house．(簡化前)
Thirsty and eager to get a little rest，he went into the tea-house．(簡化后)
7．在時(shí)間、原因、條件等狀語從句中，若從句和主句主語不一致時(shí)，可簡化為分詞復(fù)合結(jié)構(gòu)作狀語。有時(shí)也可簡化為“with/without名詞或代詞十分詞(短語)”形式作狀語。例如：
When the film start appeared, the children got exited．(簡化前)
The film start appearing，the children got exited．(簡化后)
If all the work is done, you can have a rest．(簡化前)
With all the work done，you can have a rest．(簡化后)
Nothing can live if there is no air．(簡化前)
Nothing can live without air．(簡化后)
8．讓步狀語從句的主語與主句主語一致時(shí)，可簡化為分詞短語。
作狀語；不一致時(shí)，常簡化為with或in spite of介詞短語作狀語。例如：
Although he faced his death，he didn't say anything before the enemy．(簡化前)
Facing the death，he didn't say anything before the enemy. (簡化后)
Although there was danger，he rushed out to carry the boy to safety．(簡化前)
In spite of danger，he rushed out to carry the boy to safety．(簡化后)