don ‘t be sad对还是don't be sadly对?为什么?

Don’t be sad Don't be so sad.. don't be sad/not be sad区别? please don't be sad ,please don't Recollection Don't be such a sad apple. don't be sad译中文 don't be sad.(改为同义句) 1.don't be so sad.( Don't be sad.写出同义句 don't be sad,don't be sad是什么意思（中文） Don’t be sad!Tomorrow will be a nice day Please be h_____.Don't be so sad.