کتاب روانشناسی و موفقیت

کتاب نوشتن بهتر انگلیسی (Writing Better English)

توضیحات:

When you use one of the auxiliaries with a verb, you tell to what degree of  obligation someone has to carry out the action of the verb. Look at the following sentences. The first one shows the least degree of obligation. This is something someone doesn’t have to do. The last sentence shows the greatest degree of obligation. This is something that someone absolutely must do.

• We may return the books. (Least obligation. It’s our choice.)
• We can return the books. (Little obligation. It’s our choice.)
• We are able to return the books. (Little obligation. We have the ability to do this.)
• We need to return the books. (Slight obligation.)
• We ought to return the books. (Little obligation. But this would be a good idea.)
• We should return the books. (Little obligation. But this would be a good idea.)
• We are supposed to return the books. (Some obligation. Someone has suggested we do this.)