It is unknown weather he will come or not.(主语从句
I don't know weather he will come or not.(宾语从句
The question is weather he will come or not.(表语从句
The question weather he will come or not is not settled.(同位语从句
例：09年6月真题 __________(很多人没有意识到的
例：08年12月真题
It was very dark, but Mary seemed to (本能地知道该走哪条路
know which way to take by instinct 宾语从句
例：07年12月真题
In my sixties, one change I notice is that _________________ (我比以前更容易累了
例：真题08年12月
Your resume should attract a would-be boss's attention by demonstrating _____ (为什么你是某个特定职位的最佳人选). 宾语从句
例： Since my childhood I have found that ________ (没有什么比读书对我更有吸引力