fromnowon能用于句首吗

能用于句首，例如：

1、From now on Labour will be on the back foot on the subject of welfare.今后工党在福利问题上将处于下风。

2、From now on you are free.从今以后你自由了。

3、From now on I'm going to study English every day.打这儿起我就要天天学英语了。

4、From now on you'd best concentrate on accounting alone.今后你就专门搞会计工作吧。