Incorrect | Correct |
| He should not hurry; there is plenty of time. | He need not hurry; there is plenty of time. |
| The case is serious; you should consult a good doctor. | The case is serious. You ought to consult a good doctor.
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| When I was young, I had worked for twelve hours. | When I was young. I used to work for twelve hours. |
| Should you care for a glass of milk? | Would you care for a glass of milk? |
| You should not go to college today. The teachers are on strike. | You need not go to college today. The teachers are on strike. |
| I went to him so that I should warn him of the coming danger. | I went to him so that I might warm him of the coming danger. |
| We eat so that we should live. | We eat so that we may live. |
| One must serve one’s country | One ought to serve one’s country. |
| You may not go there personally; just send someone. | You need not go there personally; just need someone. |
| Can I borrow your pen? | May I borrow your pen? |
| He ran fast so that he could catch the bus. | He ran fast so that he might catch the bus. |
| My boy, you must not have spoken this. | My boy, you should not have spoken this. |
| I cannot accept your challenge; you are too strong. | I dare not accept your challenge; you are too strong. |
| A doctor should do everything possible to save a patient. | A doctor ought to do everything possible to save a patient. |
| Had he worked hard, he might have passed. | Had he worked hard, he would have passed. |
| With the help of dictionary, you may learn new words easily. | With the help of a dictionary, you can learn new words easily. |
| I was afraid that if I asked him again he could refuse it. | I was afraid that if I asked him again, he might refuse it. |
| He was working hard so that he should get good marks. | He was working hard, so that he might get good marks. |
| When would you accompany me to Kolkata? | When will you accompany me to Kolkata? |
| He played with me when he was a boy. | He used to play with me when he was a boy. |
