Please be quiet为什么be不用is are 或am 再说前面没动词可以不用原形呀

please be quiet.变否定句.为什么? Billy,please be quiet. Please be quiet 是什么意思? And please be quiet. Silence,please!Please be quiet! so please be very quiet 中的be为什么这么用? please be very quiet为什么be动词不改变 Don't be l___.please be quiet WILL YOU PLEASE BE QUIET PLEASE怎么样 please be quiet 改为否定句 ______ ______ quiet ,please. Please be quiet (改成否定句) Please _____ ______ quiet. please be quiet 与 please keep quiet 区别是什么 “please be very quiet”这句话中,为什么要用“be”呢? so please be very quiet 的意思 please be ______(quiet) in the library Please be quiet!The other ( ) hear very! Be quiet,please!___改为—— Please be quiet.请.中文意思