分词的逻辑主语OG11-38

nemo11

 

38.    Using a Doppler ultrasound device, fetal heartbeats can be detected by the twelfth week of pregnancy.

(B)Fetal heartbeats can be detected by the twelfth week of pregnancy, using a Doppler ultrasound device.  

(D)By the twelfth week of pregnancy, fetal heartbeats
                                can be detected using a Doppler ultrasound
                                    device by a physician.

 ( E)Using a Doppler ultrasound device, a physician can detect fetal heartbeats by the twelfth week of pregnancy.

 对于B   OG的解释却说:the modifying phrase has no referent.这里是不是既可以指代fetal heartbeats又可以指代
                            pregnancy 所以说没有指代？

D，这个using 分词短语用的怎么不对啊?

aeoluseros

基本上，-ing短语放在句尾是修饰邻近的动词的，所以using a Doppler ultrasound
            device修饰的是be detected，逻辑主语是所修饰动词的逻辑主语。

B中分词短语using a Doppler ultrasound
            device逻辑主语是fetal heartbeat，fetal heartbeat不能using...所以错误

D中using a Doppler ultrasound
                device应该跟在它所修饰的名词后面，即By the twelfth week of pregnancy, fetal heartbeats can be detected by a physician using a Doppler ultrasound device

笨笨可可

以下是引用nemo11在2008-7-27 13:17:00的发言：

38.    Using a Doppler ultrasound device, fetal heartbeats can be detected by the twelfth week of pregnancy.

(B)Fetal heartbeats can be detected by the twelfth week of pregnancy, using a Doppler ultrasound device.  

(D)By the twelfth week of pregnancy, fetal heartbeats
        can be detected using a Doppler ultrasound
         device by a physician.

 ( E)Using a Doppler ultrasound device, a physician can detect fetal heartbeats by the twelfth week of pregnancy.

 对于B   OG的解释却说:the modifying phrase has no referent.这里是不是既可以指代fetal heartbeats又可以指代
       pregnancy 所以说没有指代？

D，这个using 分词短语用的怎么不对啊?

D中的using逻辑主语是heartbeats,逻辑错误。。

只能说fetal heartbeats that are used xxxx by a physcian can be detected..

nemo11

以下是引用aeoluseros在2008-7-27 13:26:00的发言：

基本上，-ing短语放在句尾是修饰邻近的动词的，所以using a Doppler ultrasound  device修饰的是be detected，逻辑主语是所修饰动词的逻辑主语。

B中分词短语using a Doppler ultrasound device逻辑主语是fetal heartbeat，fetal heartbeat不能using...所以错误

D中using a Doppler ultrasound device应该跟在它所修饰的名词后面，即By the twelfth week of pregnancy, fetal heartbeats can be detected by a physician using a Doppler ultrasound device

那也就是说D中using a Doppler ultrasound device是做定语修饰名词而不是做状语修饰动词?

aeoluseros

不是这个意思，using a Doppler ultrasound device放在by前面，而它前面又没有名词就只能做状语了，但是逻辑意思不对。它应该做名词physician的定语

nemo11

明白了，多谢~~

不过aeoluseros你这个头像差点吓倒我了