检查英语语法在线等

1,“Last year I went Beijing with my mother.” went后面少个to
2，“ I felt so happy that I went the capital of china.”went后面也少个to
3， “I cool down myself”cool应该为cooled
其他都没语法错误，但有些表达的很肤浅。

这段话翻译过来是这样的

去年我和妈妈去北京。我感到非常高兴，我去中国的首都。我们去颐和园在夜间。不幸的是，我失去了我的方式。因为有很多人在这。所以我没有办法找到我的母亲。我自己冷静下来。突然，我以为警察让我去警察局。警察帮我找到了我的母亲。我感到很高兴。告诉我，困难不害怕自己我来帮他解答冷静下来。
语法错误
NO1我感到非常高兴，我去中国的首都，我们去颐和园在夜间。
I am very happy, because I went to is the capital of China——Beijing. In the night we visited the Summer Palace
NO.2 我以为警察带我去警察局
There is a policeman, took me to the police station, where I found my mother
这些有些不通顺，要改一下
关于介词，过去式的错误

1,“Last year I went Beijing with my mother.” went后面少个to
2，“ I felt so happy that I went the capital of china.”went后面也少个to
3， “I cool down myself”cool应该为cooled