study hard English 对吗?但我看到网上都是 study English hard 为什么?

Linda is going to study hard at English this term对study hard at English提问对study hard at English提问 Lucy ( )(study) English very hard. The students study hard ( )English i hard to study english They are study English hard 和 They study English hard哪句对?They are study English hard 和 They study English hard 哪句对?为什么错.为什么对.那They are studying English hard 和 They study English hard 有什么区别。 It's hard to study English. you shouid study hard to ------ your english It is hard to study English g______well. he always _____(study) English very hard. We study english very hard同义句 learn hard还是study hard哪个对 I am working hard to study english 对吗,如果对,study为什么不是进行时studying的形式 I need to study hard 对 study hard 提问 study hard at English,还是Engilsh very hard study hard English 对吗?但我看到网上都是 study English hard 为什么? Jack studies Engish hard.Jim doesn't study English hard改成同义句Jack study English so hard Jack study hard and you will learn English well一句中开头为什么不能是to study hard 为何不写I hard study EnglishI hard study English.从语法上看没有错误啊.为什么不用?都用I study English hard .是什么原因?