Етикет: Should

Should have + past participle

The structure should have + past participle can be used to talk about past events which did not happen.

• I should have sent the money this morning, but I forgot.

This structure can also be used to talk about past events which may or may not have happened.

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Should is a modal auxiliary verb. There is no –s in the third person singular.

• He should be here soon. (NOT He shoulds …)
• You should mend your ways.

Should is followed by an infinitive without to. Questions and negatives are made without do.

• You should go now.
• Should I go now?
• No, you should not.

Note that should is the past equivalent of shall in indirect speech.

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