这句句子怎么可以这样I watched her fall asleep,and when I left her I went into the garden.1.and when 是介词加连词?通用么?2.I left her I went into the garden.为什么两个动词原形,不加上连词?

这句句子怎么可以这样I watched her fall asleep,and when I left her I went into the garden.1.and when 是介词加连词?通用么?2.I left her I went into the garden.为什么两个动词原形,不加上连词?
这句句子怎么可以这样
I watched her fall asleep,and when I left her I went into the garden.
1.and when 是介词加连词?通用么?
2.I left her I went into the garden.为什么两个动词原形,不加上连词?

这句句子怎么可以这样I watched her fall asleep,and when I left her I went into the garden.1.and when 是介词加连词?通用么?2.I left her I went into the garden.为什么两个动词原形,不加上连词?
I watched her fall asleep这是一句话
然后and 连词 后边的又是一句话
后边是用when 引导的时间状语从句,句子里边有从句,所以可以两个动词.

and 是连两个句子。。。这可以分成两个句子。。。
I watched her fall asleep。 When I left her I went into the garden.