Question

这两句话怎么合并成定语从句？

This was the lame reason. He arrived at the school late for that reason.

Answer 1

This was the lame reason why/for whichhe arrived at the school late.
方法：
1.找两句话有关联的部分，the lame reason和for that reason，可以确定先行词是reason。
2.第一个reason在句中作表语，第二个reason词组在句中作状语，考虑把第一个句子当主句，第二个句子当从句。
3.for that reason部分变成关系词引导定语从句，可用for which或why。
4.组合句子

Answer 2

He arrived the school late for the reason that the lame is bad.

Answer 3

三个：
This was the lame reason why he arrived at the school late.
这是他上学迟到的蹩脚理由。
=This was the lame reason for which he arrived at the school late.
=This was the lame reason which he arrived at the school late for.

Answer 4

将这两句话合并为定语从句，参考如下。This was the lame reason which he arrived at school late for.

Answer 5

对应的英语：
This was the reason why he was late for school.