work hard at your lesson还是on your lessonwork hard at your lesson还是on your lesson 还是都可以?

work hard at hard work hard at your lessons(改为陈述句）— —work hard at your lessons work hard at your lesson还是on your lessonwork hard at your lesson还是on your lesson 还是都可以? 英译汉:work hard at work hard at中文 work hard in还是work hard at? work hard on the subject,work hard at English,in your lesson,又是at,又是 on your success (depens/depend) on how hard you work at your lessons You'll fail your next term___you start to work hard at your studies now. You had better work hard at your lessons.改为一般疑问句—— —— ——work hard at your lessons?句式是这样 work hard at English是什么意思 I work hard at school. hard at work school I(? At work,I must work hard Please b__me-your son.I will t___my best to work hard at English. 同义句转换You must try your best to work hard at English. You had better work hard at your lessons.改为一般疑问句 那 Do you work hard at your lessons?（from now on）