Do you know our school life could be dangerous if we are not careful enough.中为什么用could?虚拟语气?表示委婉,都不像啊

What do you know about our company Do you know what( )(do)for our school trip? Do you know the man ____(chat)with our teacher? do you know when _____ (begin) our work? Do you know our English teacher name怎么改错啊 句子改错：Do you know our English teacher name Do you know the results __ our exam last week? you do not know our friends very well “do you know what our life likes in the future? Do you know much about our company,department,team? Do you know the [p ] of our exam lsat week? Do you know the captain of our football team? How much do you know about our solar system? Do you know _______will be our class teacher?whomthatwhowhich Do you know who lives (远)in our class Do you know books are our favorite?翻译 Do you know how to cook?改为同义句Do you know ___ ___ ___ ___?改为同义句Do you know how to cook?Do you know ___ ___ ___ ___?these four cookies cost the girl one dollar.the girl ___ one dollar __ these four cookies.the boy often goes to scho do you know who are our main customers?和do you know who our main customers are 有什么区别.