<font color="#ff0000">He struggled on with her writing.</font><br/><br/>I copied this sentence from one english book which was written in 18th century.<br/><br/>but i'm confused about <font color="#ff0000">on</font> and <font color="#ff0000">with. </font><br/><br/>what i knew is that <font color="#ff0000">struggle</font> is used with <font color="#ff0000">with. </font>But i couldn't solve <font color="#ff0000">on</font> why there is.