感官动词的主动语态表示主语通过感觉器官感知到某个事件的发生（开始到结束的整个过程）或正在发生（尚未结束）。前者用不带to的不定式作宾补，后者用现在分词作宾补。需要注意的是，静态动词表示的状态是不能用感觉器官直接感知的，因此静态动词不能作感官动词后的宾语补足语。

例如：I heard him open the door. I watched him open the door.

但 不能说I heard him having/have a new car. I watched him having/have a new car.

只能说 I hear（that）he has a new car.

同理，I noticed him go out through the back door. 但 I have noticed that he has a new car.

但是在被动语态中，感官动词则多是表示通过感觉器官的感知加上推理后而知晓，更接近认知动词，而不再仅仅是感官动词（知觉动词）。此时，静态动词的不定式就可以作主语补足语了。例如：

He was noticed to go out through the back door.

He was noticed to have a new car.

网友第一句中的 women were watched to have the same chewing pace as men，to have为静态动词作主语补足语。这个句子没有相应的含有复合宾语的主动语态结构。不能说：

We/They/Researchers watched women have the same chewing pace as men. (误）

正确的主动语态的句子可能是：

We/They/Researchers watched women eating and found that they had the same chewing pace as men.

感官动词的主动语态和被动语态意义的差别，可能是被动语态中作主补的不定式必须带to，而主动语态中作宾补的不定式必须省略to的原因。

see是唯一在被动语态结构中可以表示几乎“纯粹感知”意义的感官动词。用不定式还是现在分词作宾补或主补，取决于感知的动作是完整的动作还是未结束的不完整动作。