the sign means:

the sign means: 'danger',the,sign,building,on,the,means(.) the road sign means no____ (cross) The sign means danger.改为一般疑问句 the sign means “No____(音乐）!” The sign means" keep off the grass"改为同义句 The sign means we__ The sign means "Keep off the grass".改为同义句 What does the sign on the wall means?改错 The sign means “Keep off the grass.”(改为同意句) the big sign means "undergrund".The big（提问） the sign beside the door means wet floor The sign means No littering换成否定句