ought
                    - You ought to have put the milk in the refrigerator, and now ________sour.
 - He ought ot have been warned of the danger.——____, but he wouldn’t listen to me.
 - Students ought _____ the truth.
 - Students ought ______ the truth.
 - The students ought to wear school uniforms when they’re at school.
 - He ought to have been warned of the danger.—_______, but he wouldn’t listen to me.
 - You ought to have given them some advice.–________, but who cared what I said?
 - You ought to have given them some advice.— , but who cared what I asked?