“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!The other ( ) hear very! The panda is very shy ,so please be very q( ). The panda is very shy,so please be very q_____ 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 Please be very quiet.改为否定句 Please（ ）（ ）very quiet. The tree is very tall.Please be c-----填空 The tree is very tall.Please be c( ). Dangerous!I am fulling in love!Please be very Be _______,please!The panda is very shy The pands is very shy,so please be veryq什么 Please be carefully!The traffic is very busy.改错 she's very shy,so please be very quiet.改为because的句子 but she's very shy.so please be very quiet.帮我译出来, “please be very quiet”这句话中,为什么要用“be”呢? It's quie safe. please be