分类：教育/科学-学习帮助
问题：九年级英语1、MrBrownhadworkedinabankfo 
1、Mr Brown had word in a bank for a year ____he came here.(since/before)为什么用before?2、Don not laugh at her.She is ____ any of the  others in your class.(   )A.as clever a student asB.as a clever student asC.so clever a student as D.so a clever student like为什么选A?1、Mr Brown had word in a bank for a year ____he came here.(since/before)为什么用before?2、Don not laugh at her.She is ____ any of the  others in your class.(   )A.as clever a student asB.as a clever student asC.so clever a student as D.so a clever student like为什么选A?3、-Hi,Tom!Can you tell me when____ for London? -Yes,tomorrow.A.leaving B.leaves c.to leave  D.are you leaving为什么选C，不选D？4、Sam asked me,"Did you ride a bike to school yesterday?''(直接变间接）She asked me ___ ___ ___ ____a bike to school the day before.(解释一下原因，不要只写答案哦！）请大家帮帮忙，谢谢！
回答：1、since在英汉词典中译成“自从”，但其实“since”和“自从”不是完全对应。since是指从过去某时刻起一直到现在，所以当它出现在从句中时，主句要用现在完成时。came是过去时，用before，表过去的过去，正好对应主句中的过去完成时。2、在sh...as...和so...as...中，肯定句要用such，否定句和疑问句才用so，所以先排除C和D。而在as+形容词+名词+as这个结构中，不定冠词当然要放在名词前。3、非延续动词的进行时可以表将来,但是这里不能用疑问倒装形式,因为疑问已经在主句中得到了体现,如果说CanyoutellmewhenyouareleavingforLondon就对了。 dosth.是英语固定结构,当询问时间时,只要把时间副词when放在不定式符号to之前就可以了,这也是英语用法所要求的。4、if I had rided。主句动词是过去时，直接引语动词也是过去时，当直接引语变成间接引语时，就要用过去完成时，以表明“过去的过去”。眼前这个句子，ride这个动作发生在ask之前，所以要用过去完成时。再一点，直接引语是询问是还是不是，间接引语就要用if（是否）引导。