1. Because I don´t know where the switch is.
    因为我不知道开关在哪里.

2. He groped for the light switch in the dark basement.
    在黑暗的地下室中，他摸索着电灯的开关。

3. He groped for the light switch in the dark basement .
    在黑暗的地下室中，他摸索着电灯的开关。

4. He would then ride the R train to 59th Street where he would walk upstairs to switch to the Number 6 train.
    然后他得乘R线在59街下车，再往上走一层楼转搭6号列车。

5. I reach for the light switch, and as it silently lights the scene, I return to the bed to observe the patient with an unemotional, medical eye.
    我伸手去开灯。灯静静地照亮了整个病房，我走回病床边，用无动于衷的、医生的目光观察着病人。