On going ……because这个词组是什么意思啊?

问题描述:

On going ……because这个词组是什么意思啊?
I went into the kitchen.I turned on the light .It was dark.(on going ……because)
用连词改写以上3个句子

On going the kitchen,I turned on the light because it was dark!
的意思 一到厨房,我就把灯开开,因为太黑了!