Question

I want you ________ carefully how the machine is __________ ?

watch, watching, to watch, been operated, being operated, operate
I want you ________ carefully how the machine is __________
为什么要加个being

Answer 1

答：我们认为这个英语句子的空白处分别填to watch；being operated. 之所以how the machine is being operated这个宾语从句含有being，是因为这个句子用的是选择进行时的被动语态（am/ are / is being done ）.

Answer 2

①want sb to do固定用法，这里用to watch.

②be being done 进行时的被动语态的表达形式。这里operate是(使)运转，(被)使用。所以机器作主语，需要用被动。所以是be being operated.

Answer 3

答：
第一空：to watch，
第二空：being operated.

分析：
1、want 用法是：want（sb.）to do something.
2、根据上下文语境，可知machine正在被动手术。机器是动作的被执行者。
3、根据语境，观看“正在做某事”

Answer 4

I want you to watch carefully how the machine is being operated.
我想让你认真看看这个机器是怎样（被）操作的。
因为机器和操作是被动关系，所以在这里用现在进行时态的被动语态。

Answer 5

填 to watch
being operated 进行时态的被动语态

I want you to watch carefully how the machine is being operated.