look at outside 与 look outside 有什么区别 到底加不加 at After having spent my first day in the town center ,I decided to lose my way on my second day.请问，为什么用having spent ,不用 spent

look at outside 与 look outside 有什么区别 到底加不加 at After having spent my first day in the town center ,I decided to lose my way on my second day.请问，为什么用having spent ,不用 spent
look at outside 与 look outside 有什么区别 到底加不加 at
After having spent my first day in the town center ,I decided to lose my way on my second day.请问，为什么用having spent ,不用 spent

look at outside 与 look outside 有什么区别 到底加不加 at After having spent my first day in the town center ,I decided to lose my way on my second day.请问，为什么用having spent ,不用 spent
（一）
Outside 如果是一个副词的话,前面不用at,look outside是看着外面的意思,表状态.
Outside如果是一个名词的话,前面必须用at,look at outsde是向外看,表动作.
（二）
因为 after 是介词,介词后面接动名词,做宾语,spent 是动词的过去式,在句子中只能做谓语,所以不能用spent.这里只能用动名词,因为 这个动名词的动作发生在谓语decided之前,因此,用动名词的完成式having spent ,而不用一般式spending.
姐姐在学英语?佩服啊~

look outside是向外看，不能说look at outside
look at sth 是看一看

在外面看，和看外面是不一样的

前一个：看着外面；后一个：向外看，你分析一下语境吧