I gave Jim a book yesterday. （变为被动语态）

A book was given to Jim by me yesterday.

Jim was given a book by me yesterday.

变被动时什么时间+to什么时间不加呢？


请英语语法网参考：

http://www.yygrammar.com/Article/201501/3788.html

http://www.yygrammar.com/Article/200909/1355.html