名词性从句练习题目 急

一定要按名词性从句的结构翻译的话,请看：
1.Do you notice that there is something strange in her word
2.I didn't notice it was snowing heavily outside.
3.He saw a man was walking on the opposite side of the road.
4.He noticed what happened between them.
5.He didn’t know he was observed to go upstairs by someone.
6.He didn’t know someone observed him go up stairs.
observe变被动时要在另一个动词原形前加上to.