关系代词和关系副词引导定语从句的转换

1. The plane may be several hours latein which casethere’s no point in our waiting.

这种有没可能出目前限制性定语从句中，没逗号出现；which作为关系代词引导限制性定语从句，先行项为整个主句内容能吗？

2. Do you still remember the daywhen we went to visit the museum together?

这类是否把 when 等于 on which, where = in which, at which...这类是否要死记？

只有定语从句，才有这几种方法吧！

第一句可以将主句和从句变换一下，从句作主句，主句作从句：

In the case that the plane may be several hours late,there’s no point in our waiting. 原来的主句目前成了条件状语从句。in the case that合起来看成复合从属连词。后面是主句了。

第二句因为先行词是day，与day搭配的介词是on, 所以用on which. 假如先行词是year或time，定语从句就由in which或at which引导。所以，无需记忆，仅需剖析、理解。