我在努力学习 是 I study hard还是I studying hard?

我在努力学习 是 I study hard还是I studying hard? 是keep study hard还是keep studying hard? 我必须努力学习,赶上其他同学.I must study hard and_____ _____ _____the oth I must study hard? 翻译:我必须努力学习以实现我的梦想I must study hard __ __ my dream ___ _____ I will hard study English I will study more hard i hard to study english hard-study =studying hard?是固定词组么?那hard-work也是词组? I need to study hard 对 study hard 提问 I quit...I'll study hard. I wish you to study hard.是简单句还是复合句