I have to work hard at my lessons from now on.

那 Do you work hard at your lessons?（from now on） We must have to work really hard from now on. We've decided to work hard at our lessons now.同义句转换 I'm finding it hard to concentrate on my work! All the chilldren work hard at还是work hard on our lessons I will study hard from now on. from now on,I have nothing to lose怎么解释? I will study hard at other subjects from now on in order tha every day they work hard( )morning( )evening（at,on,from,to,w She can for her son so hard,I have to work hard for my son 需 Work hard at my study还是on my study? I have to work hard at school （to get good grade）对括号部分提问