Previous: shall vs will
2.2.1.2.7 should
2.2.1.2.7.1 The past tense of shall. For example:
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I told her I should go to see her.
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I thought it should be okay for him to come.
2.2.1.2.7.2 In a stronger tone or manner of speaking, expressing “if by any (remote) chance, by
any possibility, in case of (contingency),” “to one's surprise, unexpectedly.” For example:
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If the car should break down on the way, you would have to walk back.
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Should you have any queries, please feel free to write and call our office.
Notice in this manner of speaking, the speaker expresses the possibility of happening is very remote. Therefore, “should you have any queries...” carries the presumption that you likely do not have queries.
Similarly, if someone says, “If you have any questions...,” he assumes you may have questions. However, if he says, “If you should have any questions...,” he thinks you shouldn't have questions.
2.2.1.2.7.3 Expressing obligation, propriety, or expediency. For example:
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You should do as she says.
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You should help your mother with the housework.
2.2.1.2.7.4 Expressing probability, conjecture, speculation or expectation. For example:
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With an early start, they should be here by noon.
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Dinner should be ready by now.
2.2.1.2.7.5 Expressing conditions. For example:
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If he should leave his father, his father would die. — Genesis 44:22 (Revised Standard Version)
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If they should have been hardy but didn't come up or bloom, there could be several reasons.
2.2.1.2.7.6 Expressing a request in a polite manner or to soften direct statement. For example:
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Who should I see about my schedule?
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I should suggest that you consider the service finished.
2.2.1.2.7.7 Expressing sorry, surprise. For example:
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It is strange that the authorities should have agreed to the change in use of the hospital site for residential development.
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I'm sorry it should be this way.