1.b> , , ; ; sad smile [face, expression] [, ]; sad look / ; sad song ; to be / to feel / sad , , ; to make smb. sad / ; how sad that you failed in your exam / , (); we are very sad to hear that you are leaving , / ;
2.b> , ; sad misfortune / ; sad state of affairs ;
3.b> , ; , ;
4.b> .i> ; , .