You must to be eighteen years old.有什么错

He promised to arrive here before seven .it is eight now You see ,he be hereA would B should C can D must You must be logged in to watch what must you do to be safe? you must be something to talk You must be at least 13 to you must be prepared to change dictions. To make friends,you must be friend to others. 用must,have/hai to,have/has got to填空1）you can borrow the book but you( )(not)lend it to others2)( )I get back before eight o 'clock?yes you( )No you don't( )3)（）YOU( )leave now?4)you()be hungry after the long walk5)he()have walked a long w You must be strong . you must be You must be hungry You must be joking You must be confident. You must be dreaming you must be careful You must try to be calm可以说You must try calm吗 you must be willing to take sone ku You must be polite to the elder.(改为祈使句）