Question

求解定语从句怎么办啊

问题有点多 大侠们能帮几个算几个。。跪谢！

9 Mr. Smith will move into his new house next monday , ( )it will be completely finished.
A by which time B by that time 为啥选a不选b
10 certain layers of the atmosphere have special names ( )
A that indicate their characteristic properties.
B which indicated their character properties. 为啥选a不选b
11 ultrasonic sounds produce pulsed signals ( )various defects in metal can be detected.
A as a result of that B as a result of which C by means of that D by means of which
12with Miss SU'spatience and tenderness ,little Helen ( )people all thought would not have lived for long overcame her deafness and blindness and became a good writer
A who B whom 为啥选a不选b whom不是做thought的宾语吗？

Answer 1

9. 考查介词提前的非限定性定语从句。由于两句之间没有并列连词，故后一句是前一句的从属句，即：非限制性定语从句。此外，介词by提前到关系代词前，只能用which而非that。
10. 考查定语从句的时态问题。由于主从句叙述的是客观真理，故用一般现在时。
11. 考查定语从句。由于两句之间没有并列连词，故后一句是前一句的从属句，即：限制性定语从句。此外，介词of提前到关系代词前，只能用which而非that。句意：超声波产生脉冲信号，结果，金属中的不合格品（瑕疵）就会被检测到。
12. 考查定语从句。应该分析句子结构：
主句的主语是little Helen ，并列谓语是overcame和and became a good writer（系表结构构成谓语），宾语是her deafness and blindness。
定语从句中，主语是people，谓语是thought，宾语从句作宾语，该从句中would not have lived for long 前面缺少主语，所以，关系代词应该选择主格who而非宾格whom。句意：在苏小姐的耐心和温柔的帮助下，人们原本认为活不了多久的小海伦克服了自身的聋哑和全盲，成为了一名作家。

Answer 2

1. 介词后关系代词只用which不用that。这里的by which time相当于and by that time.
2. 主句是一般现在时，从句应该也用现在时。B选项是一般过去时。
3. 选D。which指代先行词pulsed signals。by means of 意思是利用，可以指某个具体的事物、手段。as a result of意思是作为...的结果。
4. 这里who不做thought的宾语. who修饰先行词helen, 把helen代入定语从句：People all thought (that) Helen would not have lived for long. Helen在that引导的宾语从句中做主语，所以用who.