1.my brother has failed again,

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/23 00:32:29

1.my brother has failed again, which makes my mother sad.老师主句为什么用了完成时，是因为again吗？ 2.here is the English grammar which, as i have told you ,will help improve your English .老师，请问as i have told you 是插入语吗？　as此处是关系代词吗？
1.my brother has failed again, which makes my mother sad.老师主句为什么用了完成时，是因为again吗？ 2.here is the English grammar which, as i have told you ,will help improve your English .老师，请问as i have told you 是插入语吗？　as此处是关系代词吗？

解题思路：关系代词as和which 引导的定语从句 as 和which 引导非限制性定语从句时，其用法有相同之处，也有不同之处。具体情况是： 1. as 和which都可以在定语从句中做主语或宾语，代表前面整个句子。如： He married her, as / which was natural. 他跟她结婚了，这是很自然的事。 He is honest, as / which we can see. 他很诚实，这一点我们看得出来。 2. as 引导的非限制性定语从句可以放在主句之前、主句之后，甚至还可以放在主句中间。 which 引导的非限制性定语从句只可放在主句之后。另外，as 常常有“正如、正像”的含义。如： As is known to all, China is a developing country. 众所周知，中国是发展中国家。 He is from the south, as we can know from his accent. 他是南方人，这一点我们从他的口音可以知道。 John, as you know, is a famous writer. 正如你所知，约
解题过程：
1.my brother has failed again, which makes my mother sad.老师主句为什么用了完成时，是因为again吗？
现在完成时表示动作发生在过去，和现在有联系
此处如果使用一般过去时也是可以的，并没有具体的必须使用现在完成时的标志性的时间状语
2.here is the English grammar which, as i have told you ,will help improve your English .老师，请问as i have told you 是插入语吗？　as此处是关系代词吗？
是非限制性定语从句，as在从句中做told的宾语
as在引导非限制性定语从句的时候，位置比较灵活，可以放在句中、句首或者句尾

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