I think study hard is happiness改错

I think study hard is happiness改错 I will study more hard i hard to study english I need to study hard 对 study hard 提问 I don't think he will study hard改为反意疑问句 I think if you study hard,you'll be able to unkerstand any culeure. Study English hard Come on!I think you wiil be successful 帮我看看这题,I think _____ _____ to study hard. I think it important to study hard和l think it is important to study hard哪个句子是对的?为什么? I think it important to study hard和l think it is important to study hard哪个句子是对的?为什么? I quit...I'll study hard.I quit...I'll study hard.我大脑迟钝... I should study hard in future I will study hard from now on. Ithing I must study hard firstxi是什么 I try________(study)hard this term. Although math diffcult,but I study hard I wish you to study hard . I study hard in moring. 是什么意思?