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Modal auxiliary verbs are a special type of auxiliary verb, used mainly to express ability, likelihood, permission, and obligation. These include 'will', 'would', 'can', 'could', 'shall', 'should', 'may', 'might', 'must', 'ought', 'need', and 'dare'. Please do not use this tag for the non-modal auxiliaries 'be', 'have', or 'do'.

1
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It can mean either one or both depending on the context of the conversation. If I was complaining to someone that the plumber hadn't come to fix a leak yet I would say, "He should have been here an …
answered Feb 20 '18 by Timinycricket
1
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You are right! the first one is asking what prevented him from doing it before and the second is usually asked after doing something he should have done sooner.
answered Feb 25 '18 by Timinycricket