16 They erected a lighthouse on the promontory to warn approaching ships of their nearness to the shore.
17 Signs across the entrances warn all visitors to stub out their cigarettes.
18 I tried to warn him, but he wouldn't listen.
19 It seems only right to warn you of the risk.
20 Facebook can gain direct access to a person's mobile and take pictures or make videos at any time without explicit consent, MPs warn as they call on social media companies to simplify their terms and conditions.
21 The story should act as a warning to other prospective buyers.
22 Mr Golding delivered an oblique warning, talking of the danger of sudden action.
23 In a coded telephone warning, Scotland Yard were told four bombs had been planted in the area.
24 Red sky at night shepherd's delight; red sky in the morning, shepherd's warning.
25 Mr Straw issued a stern warning to those who persist in violence.
26 The minister gave a warning that if war broke out, it would be catastrophic.
27 One thorn of experience is worth a whole wilderness of warning.
28 Let me give you a word of warning.
29 The warning lights were clearly visible.
30 But few at the conference in London last week heeded his warning.