He wanted to do it on his own.So he didn't ask her.的同义句

问题描述:

He wanted to do it on his own.So he didn't ask her.的同义句
He didn't ask her ------he wanted to do it -------(一空一词)

because 、 himselfbecause前面没有句号也对吗?对的、because放句中不加逗号