the road is covered with snow.i can't understand ()they insist on going by motorbike.

问题描述:

the road is covered with snow.i can't understand ()they insist on going by motorbike.
这里面i can't understand是先行词吗?所以要填定语吗?还是因为是同位语,所以要填定语呢?

需要加定语why.这是个定语从句.所以他的先行词是什么?i can't understand the reason why they insist on going by motorbike. 可以理解为先行词the reason被省略。怎么判断先行词有没有被省略呢?怎么判断状语还是定语呢把他们翻译成中文,用中文去理解有没有省略。如果用英文去理解的话,那就只能死记硬背哪些动词可以省略。比如understand.