1.b> (); what happened to your friend? ? don't let it happened again! i> ! if anything happens to me .i> , ;
2.b> i> (); the house happened to be empty ; it so happened that he had no money , ;
3.b> (); he happened to overhear the plotters i> ; I happened to have found the right words ;
to happenb> inb> .i> 1) (with) ();
2) .i> (), ;
to happen onb> .i> to happen upon;
to happen roundb> i> (); he happened round to his mother's that day ;
to happen uponb> (); I happened upon a lost article ;
as it happensb> ) , ; ) .