英语初一改句子

英语初一改句子
I found nothing.（该为同义句）
I _____ _____ _____.
The river is not safe enough for you to swim in.（该为同义句）
The river is _____ _____ for you _____ _____ _____.
It took me two days to write this article.（该为同义句）
_____ _____ two days _____ this article.
Both you and Tom are good at swimming.（改为否定句）
_____ _____ _____ _____ _____ good at swimming.
Iwent to bookshop ____once a month____ .（就画线部分提问）
_____ _____ _____ _____ _____ to the bookshop?