ought
Ex. 56, p. 467
1.
Ought to
serves to give advice. 2.
Ought to
serves to express moral obligation.
2. Advice. 3.
Ought to
serves to express obligation implying desirability. 4. Advice.
5.
Oughtn't
implies that the speaker's action may have been undesirable. 6.
Ought to
+ Perfect Infinitive shows regret that a desirable action was not carried out. 7.
Oughtn't to
+ Perfect Infinitive is used to show regret that an undesirable action was
performed. 8.
Ought to
is used to show that the speaker was feeling moral obligation.
9, 10. Supposition implying logical probability.
Ex. 57, p. 468
1. I knew I
oughtn't
to open the letter. 2. I said you
ought
to finish your work
before going out. 3. You
oughtn't
to eat between meals; it will make you fat. 4. You
oughtn't
to smoke so much; you are wasting money and doing harm to your health. 5.
I
ought
to have taken these books to the library last week. 6. You
ought
to have told
your guide that you wanted to go sightseeing all by yourself. 7. You
ought
to have
waited till the lights were green before crossing the road. 8. You
oughtn't
to have
crossed the road when the lights were red. 9. You
ought
to have seen the
performance. It was wonderful. 10. If he starts at eight, he
ought
to be there by one
o'clock.
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