I must study hard?请问:I——做“主语”,study——做“谓语”study——做“谓语”那么must的词性是什么,在句中做什么成分,修饰谁?

Ithing I must study hard firstxi是什么 _____ a student,I must study very hard. I have to study hard.I don't like geography.I must be study harder I must study hard?请问:I——做“主语”,study——做“谓语”study——做“谓语”那么must的词性是什么,在句中做什么成分,修饰谁? So We must Study hard And he must study hard What I must do is study hard.这里的study为什么不加to呢. for you,for me,for our future---you must work hard ,I must study hard中文是什么这些英文是什么 My English is poor so I must study hard to i-- it.怎麼回答 when i can go abroad?sorry,i don't know .maybe you must study hard. We must study hard 变为一般疑问句 （）a student ,we must study hard We must study hard做句型转换 She must study hard 改成一般疑问 YOUR MUST _____(study) hard every day 什么of them must study hard In order to catch up with my classmates.I must study hard.改同义句I study hard-------I can catch up with my classmate. 英语翻译是个填空题：I must study hard _____ _____ my dream ________ ________.