原句意思：
他开始他的工作前我没看说明书.
同义句意思：
Tom开始工作……说明.
这两句话不可以同义.
拟改为
Tom didn't read the intructions before he started his work
Tom开始工作前没有看说明书
=Tom started his before reading the instructions.
Tom看说明书前就开始工作了.